Wednesday, June 15, 2011

Longest Total Lunar Eclipse in 11 Years Occurs Wednesday


A total lunar eclipse is seen as the full moon is shadowed by the Earth on the arrival of the winter solstice, Tuesday, December 21, 2010 in Arlington, VA. From beginning to end, the eclipse lasted about three hours and twenty-eight minutes.
CREDIT: NASA/Bill Ingalls
The longest total lunar eclipse since July 2000 will occur on Wednesday (June 15), with skywatchers in Europe, Asia, the Middle East, Africa and Australia in prime position to witness the moon treat.

The event is the first lunar eclipse of 2011 and one of two total lunar eclipses this year. The eclipse, which will occur during June's full moon, will begin at 1:24 p.m. EDT (1724 GMT) and last until 7 p.m. EDT (2300 GMT), but it will not be visible from North America.

For observers in regions where it will be visible, the eclipse could offer an amazing sight: the period of totality will be 100 minutes. In the last 100 years, only three other eclipses have rivaled the duration of totality of this eclipse, according to SPACE.com's skywatching columnist Joe. Rao. The last lunar eclipse of similar length occured on July 16, 2000 and lasted 107 minutes.

"The entire event will be seen from the eastern half of Africa, the Middle East, central Asia and western Australia," stated the NASA Eclipse Website of the June 15 event. "Observers throughout Europe will miss the early stages of the eclipse because they occur before moonrise."



Total eclipse of the moon
Total lunar eclipses occur when the Earth passes directly between the sun and the moon, casting a deep shadow through which the moon then travels through.

"From the Earth, the moon will appear to darken and turn a deep red before eventually returning to normal," explained NASA officials at the agency's Goddard Space Flight Center in Greenbelt, Md., in an advisory. "When light from the sun goes by the side of the Earth, it passes through a long and thick layer of Earth's atmosphere. Shorter wavelengths of sunlight, like blue, are scattered by the atmosphere, so by the time the light has finished its trip to the moon, more of the longer wavelengths, like red, are left over. On the Earth, the same thing happens at sunset as the ground you stand on gradually passes into night."

Unlike their solar counterparts, lunar eclipses are safe to view without any special protective glasses or equipment.

Countries in prime viewing position
According to NASA's eclipse website, Wednesday's total lunar eclipse will be visible during its peak to skywatchers throughout Europe, with the exception of Scotland and northern Scandinavia.

In eastern South America, Western Europe and the west coast of Africa, the eclipse will occur Wednesday evening, according to Rao. Skywatchers in eastern Brazil, Uruguay and Argentina have a chance to see the lunar eclipse during its total stage, NASA officials said.

But for some countries, the event will be visible in the wee hours of Thursday (June 16) because the eclipse's region of visibility crosses the International Date Line. The early Thursday viewing times apply to observers in central Siberia, eastern Mongolia, northeast China, and most of Japan, Korea, New Guinea, eastern Australia and New Zealand, Rao explained.

"Eastern Asia, eastern Australia, and New Zealand will miss the last stages of eclipse because they occur after moonset," the NASA Eclipse Website advisory stated.

Wednesday's lunar eclipse is part of a rare three-eclipse series of events occurring in June and early July. It follows the June 1 partial solar eclipse and comes before another partial solar eclipse, which will occur on July 1 but only be visible from a remote region near Antarctica.

The second lunar eclipse of 2011 will occur on Dec. 10 and will also be a total lunar eclipse. That even should be visible from the western United States and Canada.
Article by:: SPACE.com Staff
Source: Space.com

Wednesday, June 1, 2011

Partial Solar Eclipse's Midnight Twist: Starts Thursday, Ends Wednesday


Shortly before midnight on June 1 in Tromsø, Norway, the partially eclipsed sun will hang just above the northern horizon.
CREDIT: Starry Night Software
Wednesday brings a partial solar eclipse to parts of Asia and North America, but it comes with an odd twist: At one point, the eclipse will be occurring at "midnight" between the two days this week.

During the eclipse, the outer shadow of the moon (called the penumbra) will first fall on northeast Asia as the eclipse begins, and then work its way east across the International Date Line. Because of that timing, this eclipse will have the quirky circumstance of beginning on the morning of Thursday (June 2) and ending on the evening of Wednesday (June 1).

For this partial solar eclipse, the axis of the moon's shadow, the dark cone we call the umbra, actually never hits the Earth’s surface, passing about 843 miles (1,358 kilometers) above Cheshskaya Bay and the Bolshezemelskaya Tundra of far northwestern Russia. There, the sun will be seen to dip right to the northern horizon — at the "midnight" point of its 24-hour Arctic day — before climbing again.

During the few minutes in which the eclipse will reach its peak, with the top three-fifths of the sun bitten away by the moon, the sun will take on the appearance of a huge boat sailing out over the icy Barents Sea.

Greenland and Iceland are also within the eclipse zone, the latter getting a view just before the sun begins to set in their late evening.

Solar eclipses occur when the moon passes in front of the sun as seen from the Earth's surface. Total solar eclipses occur when the moon appears to completely block the sun, but occasionally the moon's only in front of a portion of the sun. These events can create partial and so-called annular eclipses.

While total solar eclipses, which can be viewed only from the narrow path of the moon's shadow on the Earth, partial solar eclipses can be seen across much wider geographical areas.

A NASA skywatching table available here details the local eclipse viewing times for different locations around the world. WARNING: NEVER stare directly at the sun with your naked eye or through binoculars or a telescope without proper light filters. Serious eye damage can result.


ok This NASA graphic shows the track of the June 1-2 partial solar eclipse, which will begin on June 2 and end on June 1 due to a fluke of its path across the International Date Line.
CREDIT: NASA

Alaska and Canada get eclipse views
For the North Americans, we might call this the "Alcan Eclipse" since it will be visible primarily from Alaska and northern Canada.

Indeed, the eclipse will be available to the northern two-thirds of Alaska (an early afternoon event), as well as northern and eastern portions of Canada, who will see the eclipse during the course of the afternoon, as the sun slowly descends toward the west-northwest horizon. The penumbral shadow finally passes over the Earth’s surface and cross over the open waters of the Atlantic to the east of Newfoundland, as the sun is passing out of sight.

Skywatchers in Alaska who will see a very small, but noticeable, scallop taken out of the upper limb of the sun around 1 p.m. Alaska Daylight Time include those in Fairbanks, Nome and Barrow.

In Canada, careful viewers in the Maritime Provinces might be able to detect a tiny "dent" in the sun’s upper right rim. Charlottetown, P.E.I., Moncton, New Brunswick, Glace Bay, Nova Scotia and St. John’s, Newfoundland, are all just within the visibility zone of this upcoming eclipse.

One might wonder if any part of the contiguous (48) states will be able to see this eclipse and the answer is "yes," but just barely.

In Madawaska, located at the very top of the state of Maine, the dark moon will encroach upon the sun's upper limb at 6:39 p.m. EDT and move off of it just 10 minutes later. At maximum, the moon will obscure only 0.003 percent of the sun.

To call this an "eclipse" for Maine skywatchers is being charitable, to say the least!

This NASA table lists the best viewing times for the partial solar eclipse on June 1-2, 2011, including major cities and the amount of eclipse skywatchers can expect to see by location.
CREDIT: NASA
Be very careful!
Once again it needs repeating: looking at the sun without proper eye protection is dangerous. Looking at the sun is harmful to your eyes at anytime, partial eclipse or no.

Many people are under the mistaken impression that when a solar eclipse is in progress there is something especially insidious about the sun's light. But the true danger that an eclipse poses is simply that it may induce people to stare at the sun, something they wouldn't normally do.

The result can be "eclipse blindness," a serious eye injury that has been recognized at least since the early 1900s. About half of the reported victims of eclipse blindness recover their precious quality of eyesight after a few days or weeks. The other half carries a permanent blurry or blind spot at the center of their vision for the rest of their lives.

By far, the safest way to view a solar eclipse is to construct a pinhole camera.

A pinhole or small opening is used to form an image of the sun on a screen placed about three feet behind the opening. Binoculars or a small telescope mounted on a tripod can also be used to project a magnified image of the sun onto a white card. Just be sure not to look through the binoculars or telescope when they are pointed toward the sun!

A variation on the pinhole theme is the pinhole mirror.

Cover a pocket-mirror with a piece of paper that has a one-quarter-inch hole punched in it. Open a sun-facing window and place the covered mirror on the sunlit sill so it reflects a disk of light onto the far wall inside. The disk of light is an image of the sun's face.

The farther away from the wall the better; the image will be only one inch across for every 9 feet from the mirror. Modeling clay works well to hold the mirror in place. Experiment with different-size holes in the paper. Again, a large hole makes the image bright, but fuzzy, and a small one makes it dim but sharp.

Darken the room as much as possible. Be sure to try this out beforehand to make sure the mirror's optical quality is good enough to project a clean, round image. Of course, don’t let anyone look at the sun in the mirror.

Unacceptable filters include sunglasses, color film negatives, black-and-white film that contains no silver, photographic neutral-density filters and polarizing filters. Although these materials have very low visible-light transmittance levels, they transmit an unacceptably high level of near-infrared radiation that can cause a thermal retinal burn.

The fact that the sun appears dim, or that you feel no discomfort when looking at the sun through the filter, is no guarantee that your eyes are safe.
Article by: Joe Rao, SPACE.com Skywatching Columnist
Source: Space.com

Monday, May 30, 2011

Last Chance to See Space Shuttle Endeavour in Night Sky … Ever


NASA's space shuttle Discovery and the International Space Station are seen in this time-lapse image as they fly over Leiden, The Netherlands, just before the two spacecraft docked on March 17, 2009 during the STS-119 mission. The shuttle is the object slightly fainter and lower in the sky. Movement is from right to left
CREDIT: Marco Langbroek
With NASA's space shuttle Endeavour set to undock from the International Space Station late Sunday (May 29), skywatchers across much of the United States and southern Canada are in for a real treat: They'll have one last chance to see Endeavour in the night sky before the shuttle retires for good.

The best times to look for Endeavour and the space station will be before sunrise on Monday and Tuesday (May 30 and 31). Weather permitting, there should be opportunities to see both the Endeavour and space station flying across the sky from many locations.

The sight should easily be visible to anyone, even from brightly lit cities. Considering that after this shuttle mission there will be only be one left before the program ends (tentatively set for July 8), the view of a shuttle and the space station flying together will soon be a sight that will pass into history.

Endeavour is in the homestretch of its last mission, a 16-day trip to upgrade and resupply the space station. The shuttle launched into space from NASA's Kennedy Space Center in Florida on May 16. Endeavour and its six-astronaut crew are due to return to Earth June 1.

Other satellites visible too
The appearance of either the space shuttle or the space station moving across the sky is not in itself unusual. On any clear night within a couple of hours of local sunset or sunrise and with no optical aid, you can usually spot several orbiting Earth satellites creeping across the sky like moving stars.

Satellites become visible only when they are in sunlight and the observer is in deep twilight or darkness. This usually means shortly after dusk or before dawn.

What makes the prospective upcoming passages so interesting is that you'll be able to see the two largest orbiting space vehicles in the sky at the same time.

Endeavour will undock from the space station Sunday at 11:53 p.m. EDT (0353 May 30 GMT). Endeavour will fly around the space station before finally pulling away at 4:36 a.m. EDT (0836 GMT).

Monday morning, Endeavour should still be visible at a relatively close distance to the space station until its scheduled return to the Kennedy Space Center in Florida early Wednesday morning.

What you can see
Here's what you can expect to see if you have a clear view of the night sky and good weather:

On Monday, Endeavour and the space station will be traveling across North America on southwest-to-northeast trajectories and should appear as a pair of very "bright stars." The space station should appear as the noticeably brighter object and will be trailing Endeavour as they move across the sky.

Across much of the eastern half of the United States, the two spaceships will fly overhead at around 4:46 a.m. EDT, only about 10 minutes after Endeavour has begun maneuvering away from the space station. As a result, the two spacecraft will appear exceptionally close, separated by only about 7 arc minutes — roughly equal to only about one-quarter the apparent width of the moon.

Binoculars will certainly aid in visually separating the two. That narrow gap between the two will have significantly widened when Endeavour and the space station fly over the western United States, just over 90 minutes later.

And for all observers in the United States and southern Canada, the separation will have increased to 30 degrees or more by Tuesday morning. Your clenched fist held at arm's length measures roughly 10 degrees; so on Tuesday expect Endeavour and the station to separated by about "three fists."

A large telescope would be needed to make out details of the sprawling station. Traveling in their respective orbits at approximately 18,000 mph (29,000 kph), both should be visible anywhere for about one to five minutes (depending on the particular viewing pass) as they glide with a steady speed across the sky.

Because of its size and configuration of highly reflective solar panels, the space station is now, by far, the brightest man-made object currently in orbit around the Earth.

Astronomers measure the brightness of a sky object in terms of magnitude, a reverse scale in which the lower an object's number, the brighter it appears in the sky.

On favorable passes, the station approaches magnitude -5 in brightness, which would rival the planet Venus and is more than 25 times brighter than Sirius, the brightest star in the night sky. Some skywatchers can even catch a glimpse of the space station just before sunset or shortly after sunrise.

And as a bonus, sunlight glinting directly off the solar panels can sometimes make the space station appear to briefly flare in brilliance.

Region of visibility
Generally speaking, on the mornings of May 30 and 31, the tandem will be visible across parts of southern Canada as well as most of the 48 contiguous United States (Hawaii and Alaska, will not have favorable viewing passes during this upcoming week).

Across the northern half of the United States there will be two or three morning viewing opportunities. For some favored locations, like Philadelphia, Washington D.C. and Richmond there will be as many as four opportunities.

Over the southern United States, the viewing opportunities will be reduced to just one (on May 30). Places below latitude 30 degrees north will unfortunately be denied a view of the "dynamic duo" because they'll appear too low in the sky and too near to sunrise to be easily visible. From Florida, for example, Jacksonville will get a brief view on Monday morning, but the rest of the state will be shut out.

In contrast, some northern localities will be favored with exceptionally good views.

From St. Louis, for instance, the space station and Endeavour will appear to suddenly emerge from out of the Earth’s shadow on Monday morning at a very high altitude of 72 degrees (more than "seven fists") above the southeast horizon during a short 1-minute pass beginning at 3:47 a.m. CDT.

And on Tuesday morning, as seen from Providence, RI, Endeavour will appear about 30 degrees out in front of the space station as they each emerge from the Earth’s shadow about halfway up in the southwest sky at 3:38 a.m. EDT, taking two minutes to track to the northeast.

At their highest point, the two spacecraft will reach altitudes of 87 and 86 degrees respectively, passing virtually directly overhead.

Europe too!
Europeans will also be favored with views in their pre-sunrise skies.

Both spacecraft will still be docked and will appear as a single very bright "moving star" on Monday morning, but they’ll be widely separated by 25 or 30 degrees on Tuesday morning. Northern locations, such as London will get only one chance (on Tuesday morning), but locations farther south, such as Madrid and Rome, will get up to three opportunities during the Monday/Tuesday interval.

And like Providence, Madrid will have an opportunity to see a nearly overhead pass of both spacecraft on Tuesday morning beginning at 5:03 local time.

When and where to look

So what is the viewing schedule for your particular hometown? You can easily find out by visiting one of these three web sites:
* Chris Peat's Heavens Above
* NASA's SkyWatch
* Spaceweather.com
Each will ask for your zip code or city, and respond with a list of suggested spotting times. Predictions computed a few days ahead of time are usually accurate within a few minutes. However, they can change due to the slow decay of the space station's orbit and periodic reboosts to higher altitudes. Check frequently for updates.

Another great site is Real Time Satellite Tracking, which shows you what part of the Earth the space station or shuttle happen to be over at any given moment during the day or night.

Endeavour's STS-134 mission is NASA's second-to-last shuttle mission before the 30-year program is retired for good.Like its sister ships Discovery and Atlantis, Endeavour will eventually be put on public display as a museum piece.
Article by: Joe Rao, SPACE.com Skywatching Columnist
Source: Space.com

Four Planets Align Near Moon on Memorial Day Weekend


This sky map of the pre-dawn sky shows the Memorial Day alignment of four planets near the moon on Memorial Day weekend, Monday, May 30, 2011 at 5:30 a.m. local time in the United States.
CREDIT: Starry Night Software
The unusual month-long convergence of four planets in the pre-dawn sky is nearing an end, as the planets begin separating from each other and going their separate ways. But one final series of meetings is on tap for this Memorial Day weekend.

Between Sunday and Tuesday (May 29 and 31), the planets Jupiter, Venus, Mars and Mercury will appear in a grouping with a bonus visitor: the moon. Weather permitting, skywatchers can look low to the east-northeast horizon about a half hour before sunrise and see the four planets arrayed in a line.

The sky map of the four planets here shows how they will appear from mid-northern latitudes in North America on Monday (May 30).

Your clenched fist held at arm’s length measures roughly 10 degrees of the sky, and the planetary alignment will stretch across 20 degrees. So the four planets will be stretched out over a portion of the sky measuring about "two fists" in length.

To see or not to see
But actually seeing all four planets is something else altogether. Those blessed with clear skies will certainly see Jupiter, hovering about 15 degrees above the horizon almost due east.

Shining about twice as bright as the brightest star in the sky (Sirius), Jupiter can be easily seen through the bright morning twilight as a silvery, non-twinkling "star."

Much farther down to Jupiter's lower left will shine an even more brilliant planet: Venus, which has been a dominant object in the morning sky since last November, but in recent weeks, has dropped very low into the pre-sunrise glow. Only its great brightness (it shines about five times brighter than Jupiter) allows it to still be seen despite its low altitude and the bright sky background.

If you have binoculars, scan that part of the sky a few degrees above and to the right of Venus and you might run across Mars, a yellow-orange starlike object shining only about one-hundredth as bright as Venus.

Lastly, below and to the left of Venus is Mercury, which although shining much brighter than Mars, probably will not be visible even in binoculars because of its very low altitude – only 2 degrees above the horizon.

Those who live south of the equator, where the planets have been climbing higher in the eastern sky and rising in a darker sky, all four planets have been putting on a great show all during May and will continue to be well seen into the final days of this month.

Enter the moon
As for the moon, early on Sunday morning, you'll see it as a delicate crescent, a slender sliver about 11 percent illuminated, hovering five degrees above and just to the left of Jupiter. The two will make for a very pleasing scene in the brightening dawn sky.

On Monday morning, the crescent will appear about half as thin (about 6 percent illuminated ) and only about half as high up as on Sunday. It will have moved far off to Jupiter's left, but will still be high above and to the right of Venus.

The real challenge comes on Tuesday morning, when the crescent will have shrunk to a mere hairline, just 2 percent illuminated. It will then be only about 36 hours from new phase, and 5 degrees to the left of Venus.

You may need binoculars to pick up the moon in the bright twilight glow.

Where do we go from here?
Jupiter will continue rising several minutes earlier each morning, slowly getting higher and more prominent in the days to come in the morning sky.

On the other hand, Venus has been slipping slowly down into the sunrise fires. It should still be visible for another five or six weeks, albeit very low to the east-northeast horizon about a half hour before sunrise before finally disappearing into the sun's glare for the summer.

Mars, like Jupiter is moving away from the sun, although more slowly; don't expect to readily see it in the morning sky until sometime during July. By August, it will be an easy object to see, rising before the break of dawn.

And little Mercury will rapidly sweep into obscurity in the coming days, passing behind the sun (called a superior conjunction) on June 12 and reappearing early in July for evening viewers.

Article by: Joe Rao, Space.com Skywatching Columnist
Source: Space.com

Monday, May 23, 2011

Rescuers race to find survivors of Joplin tornado

JOPLIN, Mo. – Rescue crews dug through piles of splintered houses and crushed cars Monday in a search for victims of a half-mile-wide tornado that killed at least 116 people when it blasted much of this Missouri town off the map and slammed straight into its hospital.

It was the nation's deadliest single twister in nearly 60 years and the second major tornado disaster in less than a month.

Authorities feared the toll could rise as the full scope of the destruction comes into view: house after house reduced to slabs, cars crushed like soda cans, shaken residents roaming streets in search of missing family members. And the danger was by no means over. Fires from gas leaks burned across town, and more violent weather loomed, including the threat of hail, high winds and even more tornadoes.

At daybreak, the city's south side emerged from darkness as a barren, smoky wasteland.

"I've never seen such devastation — just block upon block upon block of homes just completely gone," said former state legislator Gary Burton who showed up to help at a volunteer center at Missouri Southern State University.

Unlike the multiple storms that killed more than 300 people last month across the South, Joplin was smashed by just one exceptionally powerful tornado.

Not since a June 1953 tornado in Flint, Mich., had a single twister been so deadly. That storm also killed 116, according to the National Weather Service.

Authorities were prepared to find more bodies in the rubble throughout this gritty, blue-collar town of 50,000 people about 160 miles south of Kansas City.

Gov. Jay Nixon told The Associated Press he did not want to guess how high the death toll would eventually climb. But he said: "Clearly, it's on its way up."

Seventeen people were pulled alive from the rubble. An unknown number of people were hurt.

While many residents had up to 17 minutes of warning, rain and hail may have drowned out the sirens.

Larry Bruffy said he heard the first warning but looked out from his garage and saw nothing. "Five minutes later, the second warning went off," he said. "By the time we tried to get under the house, it already went over us."

As rescuers toiled in the debris, a strong thunderstorm lashed the crippled city. Rescue crews had to move gingerly around downed power lines and jagged chunks of debris as they hunted for victims and hoped for survivors. Fires, gas fumes and unstable buildings posed constant threats.

Teams of searchers fanned out in waves across several square miles. The groups went door to door, making quick checks of property that in many places had been stripped to their foundations or had walls collapse.

National Weather Service Director Jack Hayes said the storm was given a preliminary label as an EF4 — the second-highest rating assigned to twisters based on the damage they cause.

Hayes said the storm had winds of 190 to 198 mph. At times, it was three-quarters of a mile wide.

Some of the most startling damage was at St. John's Regional Medical Center, where staff had only moments to hustle their patients into the hallway. Six people died there, five of them patients, plus one visitor.

The storm blew out hundreds of windows and caused damage so extensive that doctors had to abandon the hospital soon after the twister passed. A crumpled helicopter lay on its side in the parking lot near a single twisted mass of metal that used to be cars.

Dr. Jim Riscoe said some members of his emergency room staff showed up after the tornado with injuries of their own, but they worked through the night anyway.

"I spent most of my life at that hospital," Riscoe said at a triage center at Joplin's Memorial Hall entertainment venue. "It's awful. I had two pregnant nurses who dove under gurneys ... It's a testimony to the human spirit."

Once the center of a thriving mining industry, Joplin flourished though World War II because of its rich lead and zinc mines. It also gained fame as a stop along Route 66, the storied highway stretching from Chicago to Santa Monica, Calif., before freeways diminished the city's importance.

The community, named for the founder of the area's first Methodist congregation, is now a transportation crossroads and manufacturing hub. It's also the hometown of poet Langston Hughes and "Gunsmoke" actor Dennis Weaver.

Major employers in and around the city include electronics manufacturer LaBarge Inc., colleges such as Missouri Southern State University and hospitals and clinics. Agriculture is also important to the economy.

As the tornado bore down on their trailer home, Joshua Wohlford, his pregnant girlfriend and their two toddlers fled to a Walmart store. The family narrowly escaped after a shelf of toys partially collapsed, forming a makeshift tent that shielded them.

"It was 15 minutes of hell," Wohlford said.

At a Fast Trip convenience store, another 20 people ran into a pitch-black cooler as the building began to collapse around them. They documented their experience with a video that was drawing tens of thousands of views online by Monday afternoon. The audio was even more terrifying than the imagery — earsplitting wind, objects getting smashing, wailing children and a woman praying repeatedly.

Brennan Stebbins said the group crouched on the floor, clinging to and comforting each other until they were able to crawl out. No one was seriously hurt.

Shielded by mattresses, former lawmaker Chuck Surface rode out the storm in his basement with his wife, daughter, granddaughter and dog. After about five minutes, the deafening roar abruptly stopped.

"When it got to where we thought we could look out," he said, "we went to the top of the stairs and there was no roof — it was all open air."

Dazed survivors tried to salvage clothes, furniture, family photos and financial records from their flattened or badly damaged homes.

Kelley Fritz rummaged briefly through what was left of a storage building, then gave up. Her boys, both Eagle Scouts, rushed into the neighborhood after realizing every home was destroyed.

When they returned, she said, "my sons had deceased children in their arms."

Others just waited for answers.

Justin Gibson stood outside the tangled remains of a Home Depot and pointed to a black pickup that had been tossed into them. It belonged to his roommate's brother, last seen at the store with his two young daughters.

"I don't know the extent of this yet," Gibson said, "but I know I'll have friends and family dead."

Last month, a ferocious pack of twisters roared across six Southern states, killing more than 300 people, more than two-thirds of them in Alabama.

As in the Midwest, the Southerners also had warning — as much as 24 minutes. But those storms were too wide and too powerful to escape. They obliterated entire towns from Tuscaloosa, Ala., to Bristol, Va., in what the weather service said was the nation's deadliest tornado outbreak since April 1974.

"This was one tornado," said Greg Carbin, warning specialist with the Storm Prediction Center in Norman, Okla. "It was not the same type of large-scale outbreak."

It did, however, get the attention of those who suffered in the South.

"We're praying for those people," said retired Marine Willie Walker, whose Tuscaloosa home suffered more than $50,000 in damage. "We know what they're going through because we've been there already."

Forecasters said severe weather would probably persist all week. Arkansas, Kansas, Missouri and Oklahoma could see tornadoes through Tuesday, and the bad weather could reach the East Coast by Friday.

The twister that hit Joplin was one of more than 50 reported across seven Midwest states over the weekend. One person was killed in Minneapolis and another in Kansas, but Missouri took the hardest hits.

Triage centers and shelters around Joplin rapidly filled to capacity. At a Lowe's home-improvement store, wooden planks served as cots.

Kerry Sachetta, principal of a flattened Joplin High School, could barely recognize his own building.

"You see pictures of World War II, the devastation and all that with the bombing," he said. "That's really what it looked like."

___
Associated Press Writer David A. Lieb in Jefferson City contributed to this report.
Article by: Alan Scher Zagier and Jim Salter, Associated Press
Source: Yahoo! News

Jupiter's Moon Shadows Move Like Clockwork


On the morning of Wed, May 25, 2011 the moons Io and Europa and their shadows will cross the face of Jupiter.
CREDIT: Starry Night Software
Did you know that there is a gigantic and extremely accurate clock with four "hands" in our solar system? And that you can watch this clock on nearly any clear night?

The cosmic timepiece is created by Jupiter's four largest moons — Io, Europa, Ganymede and Callisto, which behave like hands on a clock with the gas giant planet at the center. As the moons cross Jupiter's face, they create shadows visible in telescopes, and skywatchers have a chance to spot this moon shadow play on May 25.

The Jupiter clock was discovered by Italian astronomer Galileo Galilee in 1609 when he first turned his newly constructed telescope toward the planet.

The Jupiter clock
Like the hands of any good clock, the four Galilean moons of Jupiter travel around the planet with extreme accuracy.

When the Jovian moons are off to the side of Jupiter, they are easy to see in the smallest of amateur telescopes as tiny bright points of light. When they pass directly in front of Jupiter, they almost vanish against the bright background of the planet.

When the sun, as seen from Earth, is off to the side, the moons cast their shadows on the face of Jupiter, causing eclipses. Although these shadows are very small, they are also very dark and can be seen in medium-size telescopes with at least a 90mm aperture.

Because the volcanic moon Io whizzes around Jupiter once every 1.8 Earth days, its shadow is the one most commonly seen. Europa takes 3.5 days to complete the circuit, so its shadow is seen less often.

Ganymede's shadow is rarer still, and at present, Callisto's shadow misses Jupiter entirely.

Because Europa's period is almost exactly twice that of Io, they often line up to cause "double features."

The Jupiter window
With Jupiter's satellites spinning around the planet so quickly, you'd think we’d often see these shadows. However, each shadow takes only an hour or so to cross Jupiter, and the planet itself is visible for only a brief period every day.

This is especially true this early in the apparition, when we catch only brief glimpses of Jupiter between when it rises high enough to clear the turbulence in Earth's atmosphere and when the sun floods our sky with light.

In late May this "window" opens briefly around 5:30 a.m. local time. The exact times vary from location to location; any planetarium program will let you narrow it down. Here are some examples from different locations in the United States:
Jupiter and its transiting moons are only visible for a brief time in Late May 2011.
CREDIT: Starry Night Education
As you can see, the farther north you are, the "narrower" your window is. In Florida, it's 50 minutes long. In Amarillo, nearly half an hour, and in Seattle, none at all. The sun rises over Seattle nine minutes before Jupiter would be high enough to observe.

Fortunately, a double transit takes quite a while to unfold, so even if you have a limited window, you may still see part of the show.

Jupiter phenomena
As mentioned earlier, this "clock" is very accurate, so the “phenomena” of Jupiter’s satellites can be calculated far in advance, and tables are available in the RASC Observer’s Handbook and on the Internet.

The first of the current series of double transits is not visible from North America, but the second in the series will be, on Wednesday, May 25. What you have happening is two satellites, Io and Europa, passing in front of Jupiter, casting their shadows ahead of them.

The timings of the series of events are as follows (times are usually given in Universal Time, but are converted to major time zones below):
Io and Europa transit Jupiter on May 25, 2011.
CREDIT: Starry Night Education
If this seems confusing to you, think of two dancers, Io and Europa, entering from the left side of a stage, with a light to their left casting their shadows on the stage backdrop. The shadows enter first, then the performers. At the end of the scene, the shadows leave first, followed by the performers.

If you match up the times of the events with the observing windows above, you’ll see that an observer in any part of the country sees only part of the show.

Observers on the eastern seaboard will see only the beginning; those on the West Coast will see only the end. Those in the middle will see most of the show.
Article by: Geoff Gaherty, Starry Night Education
Source: Space.com

Lonely Rogue Worlds Surprisingly Outnumber Planets with Suns


Artist's concept showing a free-floating planet with roughly the mass of Jupiter. These lone worlds, perhaps ejected from the planetary systems of their birth, are probably more common in our galaxy than stars.
CREDIT: NASA/JPL-Caltech/R. Hurt
Astronomers have discovered a whole new class of alien planet: a vast population of Jupiter-mass worlds that float through space without any discernible host star, a new study finds.

While some of these exoplanets could potentially be orbiting a star from very far away, the majority of them most likely have no parent star at all, scientists say.

And these strange worlds aren't mere statistical anomalies. They likely outnumber "normal" alien planets with obvious parent stars by at least 50 percent, and they're nearly twice as common in our galaxy as main-sequence stars, according to the new study.

Astronomers have long predicted the existence of free-flying "rogue alien planets." But their apparent huge numbers may surprise many researchers, and could force some to rethink how the planets came to be.

"Previous observations of bound planets tell us only about planets which are surviving in orbits now," said study lead author Takahiro Sumi, of Osaka University in Japan. "However, [these] findings inform us how many planets have formed and scattered out."

Alien worlds under gravitational lens
Sumi and his colleagues made the find using a method called gravitational microlensing, which watches what happens when a massive object passes in front of a star from our perspective on Earth. The nearby object bends and magnifies the light from the distant star, acting like a lens.

This produces a "light curve" — a brightening and fading of the faraway star's light over time — whose characteristics tell astronomers a lot about the foreground object's size. In many cases, this nearby body is a star; if it has any orbiting planets, these can generate secondary light curves, alerting researchers to their presence.

Before the current study, astronomers had used the gravitational microlensing technique to discover a dozen or so of the nearly 550 known alien planets. (NASA's Kepler mission has detected 1,235 candidate planets by a different method, but they still need to be confirmed by follow-up observations.)

Sumi and his team looked at two years' worth of data from a telescope in New Zealand, which was monitoring 50 million Milky Way stars for microlensing events. They identified 474 such events, including 10 that lasted less than two days.

The short duration of these 10 events indicated that the foreground object in each case was not a star but a planet roughly the mass of Jupiter. And the signals from their parent stars were nowhere to be found.

Independent observations from a telescope in Chile backed up the finds. Either these 10 planets orbit very far from their host stars — more than 10 times the Earth-sun distance — or they have no host stars at all, researchers said.

Common throughout the galaxy
Gravitational microlensing events are rare, because they require the precise alignment of a background star, a massive foreground object and Earth. So the discovery of 10 short-duration events in two years suggests a huge population of these unbound or distantly orbiting Jupiter-mass exoplanets throughout the galaxy, researchers said.

Sumi and his team calculated, in fact, that these planets are probably almost twice as common in our own Milky Way as main-sequence stars. And they likely outnumber "normal" planets with known host stars by more than 50 percent.

Other studies have established that it's probably pretty rare for huge planets to orbit more than 10 Earth-sun distances from a parent star. So the research team argues that most of the Jupiter-mass planets — at least 75 percent of them — are likely true "rogues," floating through space unbound to a star.

Theory predicts that such rogues should exist throughout the galaxy, and other researchers have found evidence of unbound objects that may indeed be orphan planets. But those worlds were much bigger, from three to 10 times Jupiter's mass, and there's a lot of uncertainty in the measurements.

Many of the previously detected objects could actually be "failed stars" known as brown dwarfs, Sumi said.

Sumi and his colleagues report their results in the May 19 issue of the journal Nature.

Rethinking planetary formation theories
The newly discovered rogue planets may have formed close to a host star, then been ejected from their solar systems by the gravitational influence of a huge neighbor planet, researchers said. Indeed, such planet-planet interactions are thought to be responsible for the odd, extremely close-in orbits of the giant alien planets known as "hot Jupiters."

But the abundance of the seemingly starless worlds may force astronomers to rethink some of their ideas about planet formation, according to Sumi.

The "current most recognized planetary formation theory (core accretion model) cannot create so many giant planets," Sumi told SPACE.com in an email interview. "So we need a different theory to create [so] many giant planets, such [as the] gravitational instability model."

In the core accretion model, dust coalesces to form a solid core, which later accretes gas around it, creating a planet. The gravitational instability model invokes the rapid collapse of gas, with a core forming later due to sedimentation.

The new study should inspire much follow-up research. One of the next steps could involve training more instruments on the microlensing alien planets, further monitoring them for any signs of a parent star. Such work, which may take years, could eventually reveal how many of these worlds actually do have parent stars, and how many are true rogues.

"The implications of this discovery are profound," astronomer Joachim Wambsganss, of Heidelberg University, wrote in an accompanying essay in the journal Nature. "We have a first glimpse of a new population of planetary-mass objects in our galaxy. Now we need to explore their proper­ties, distribution, dynamic states and history."
Source: Space.com

Tuesday, May 10, 2011

Mercury, Venus, Mars & Jupiter Converge in Night Sky


In May and June 2011, four planets will converge in the night sky.
CREDIT: Starry Night Software
During this month of May, four bright planets will engage in a fascinating dance with each other in the morning sky.

Mercury, Venus, Mars and Jupiter will be involved in a series of conjunctions, joined at the end of the month by a very thin, waning crescent moon. We could even refer to this as a "celestial summit meeting," or more precisely, a series of summit meetings during May 2011.

Twice during May three planets will converge to form a "trio."

According to Belgian calculator Jean Meeus, a trio is when three planets fit within a circle with a minimum diameter of 5 degrees. Such a limit was one that Meeus chose more or less arbitrarily, but as he notes, "We have to make a choice."

On Wednesday (May 11), Mercury, Venus and Jupiter will converge within 2.05-degrees of each other, followed just 10 days later by another trio, this time formed by Mercury, Venus and Mars, which will crowd within a 2.13-degree circle. Then late in the month, on three successive mornings, May 29th, 30th, and 31st, the waning crescent moon will arrive, sweeping past Jupiter, Mars, Venus and Mercury stretched out across the eastern sky from upper right to lower left.

Evil omen? Impending disaster?

What might ancient sky watchers from 500 or 1,000 years ago have ascribed to such a series of gatherings as this?

Most likely, they would have felt a mixture of fear and wonder. A fine example was a case in 1186 A.D. when an unusual gathering of the five planets visible to the naked eye resulted in a near-panic across the whole of Europe after religious leaders predicted that worldwide disasters would result!

Even today, in our modern world, similar fears sometimes arise.

You need only Google-search the date May 5, 2000, and you will find a number of different websites that predicted a variety of disasters attributed to the combined gravitational and tidal forces associated with a gathering of the sun, moon, Mercury, Venus, Mars, Jupiter and Saturn.

One website proclaimed that it would be "one of the most exciting, powerful and transformative celestial events of our millennium according to astronomy and astrology experts."

In many ways, these words sound all too similar to the hype and tripe that has been bandied about during these past few years concerning the Mayan Long Count calendar in 2012.

Needless to say, we all survived the recent 2000 celestial summit and despite what you might hear or read in the coming days ahead, absolutely nothing cataclysmic will take place (at least nothing that can be directly attributed to this impending dawn gathering of the moon and planets).

Tough to see

The only tragedy regarding this display is that those living north of the equator will have a difficult time seeing it.

At first glance there doesn't appear to be any problem concerning the visibility of these objects. Their elongations from the sun will range from 18 degrees to 26 degrees, which should place them all in dark skies. Unfortunately, during May, as seen especially from mid-northern latitudes, the ecliptic is oriented at a shallow angle relative to the eastern horizon at dawn.

As a result, the moon and planets will rise into view during late twilight and will lie very low to the east-northeast horizon by sunrise. To see them, you'll have to make sure not to have any potential obstructions to your visibility such as trees or buildings in that direction.

But coming above the horizon so near to sunrise will also mean that you'll have a fighting chance of catching only Venus (magnitude -4) and Jupiter (magnitude -2) with unaided eyes. Whether you will be able to glimpse zero-magnitude Mercury is debatable, and certainly binoculars will be needed if you have any hope of seeing Mars (magnitude +1).

The crescent moon will also prove to be a visual challenge, being only 2 percent illuminated on May 31. Low-lying clouds or haze near the horizon on any given morning will only reduce your chances of success.

In contrast, those of our SPACE.com readers in the Southern Hemisphere, where the ecliptic at dawn appears at a somewhat steeper angle, will see this ever-changing array somewhat higher and in a somewhat darker sky; more like mid-twilight as opposed to late twilight in the north.

Indeed, those living in far southern locations such as Cape Town, South Africa; Melbourne, Australia; or Dunedin, New Zealand, will have a much better chance of seeing and enjoying this month-long dance of the planets.
Article by: Joe Rao, SPACE.com Skywatching Columnist
Source: Space.com

Thursday, May 5, 2011

Meteor Shower Tonight to Rain Bits of Halley's Comet on Earth


Bits and pieces of the famous Halley's Comet will light up the overnight sky in a promising meteor shower, weather permitting, skywatching experts say.

The annual Eta Aquarid meteor shower will peak early tomorrow morning (May 6) and is expected to put on a dazzling display of "shooting stars" for skywatchers graced with good weather and clear skies. That's because the moon, which is currently in its unlit new phase, won't interfere with the meteor light show as it did with last month's Lyrid shower.

The Eta Aquarids are meteors created by bits of left over material from Halley's Comet as it travels through the solar system on its 76 year orbit. This year, the display runs from April 28 through May 21, but May 6 should mark its peak, according to the American Meteor Society.

"Under ideal conditions (a dark, moonless sky) about 30 to 60 of these very swift meteors can be seen per hour," advises SPACE.com skywatching columnist Joe Rao. "And with a new moon on May 3 this is one of those years when observing conditions will be perfect."

This sky map of the Eta Aquarid meteor shower shows where the meteors will appear to originate from during their display. The best time to see them will be early Friday morning before 2 a.m. and 3 a.m. Local Time.

The Earth passes through the comet Halley's debris trails twice a year – once in May, and again in October – offering an appetizer for the comet's next trip through the inner solar system in 2061. Halley's comet last swung by in 1986.

NASA scientists say that the combination of the Eta Aquarid meteor shower and lack of moonlight should offer a rare chance for avid meteor-hunting skywatchers.

"This is your one chance this year to see meteors blaze across the sky without glaring moonlight dimming them," said NASA astronomer Bill Cooke, a member of the Space Environments team at the Marshall Space Flight Center in Huntsville, Ala., in a statement.



Here's how to see the Eta Aquarid meteor shower created by Halley's Comet, according to NASA:

The Eta Aquarid meteors appear to radiate out of the east-southeastern sky in the constellation Aquarius. But according to Cooke, you don't have stare in the constellation's direction to see the meteors.

"Meteors can appear in any part of the sky," Cooke explained. "In fact their trails will tend to point back toward the radiant, so if you look that way the meteor may appear somewhat stubby. They'll appear much longer going by you than coming at you."

If you have a dark, wide view of the night sky, you should be able to see some meteors by just lying down and gazing upwards. A good blanket or a comfortable outdoor chair is useful for long skywatching vigils.

"Eta Aquarids are fast, moving at 66 km/s (148,000 mph), and often trace long paths across the sky, sometimes leaving glowing, persistent trains," Cooke said. "In the Northern Hemisphere, depending on your latitude [the closer to the equator the better], you should see from 10 to 40 meteors just before dawn."
Article by: Tariq Malik, SPACE.com Managing Editor
Source: Space.com

Meteor Shower Spawned by Halley's Comet Peaks Friday


An image of Halley's Comet taken in 1986.
CREDIT: NASA
It has been 25 years since Halley's Comet last passed through the inner solar system, but an annual meteor shower keeps the icy wanderer's legacy on Earth alive this week.

Halley's Comet takes roughly 75 years to circle the sun, but if you're 30 years old or younger, you either have little or no memory of this famous cosmic vagabond's 1986 trip by Earth. And your next chance will come in the summer of 2061.

But if you don’t want to wait until 2061, you might want to step outside before sunrise during these next few mornings and try to catch a view of some "cosmic litter" that has been left behind in space by Halley's comet — a summer display of "shooting stars". [Video: Meteors from Halley's Comet]

The orbit of Halley's Comet closely approaches the Earth's orbit at two places, creating a rain of striking meteors for skywatchers during both instances. One point is in the middle to latter part of October, producing a meteor display known as the Orionids. The other point comes now, in early May, producing the annual Eta Aquarids meteor shower.

When and where to watch

The Eta Aquarid meteor shower is predicted to peak early Friday morning (May 6).

Under ideal conditions (a dark, moonless sky) about 30 to 60 of these very swift meteors can be seen per hour. And with a new moon on May 3 this is one of those years when observing conditions will be perfect. The shower appears at about one-quarter peak strength for about three or four days before and after May 6. [Spectacular Leonid meteor shower photos]

There is, however, a drawback if you plan to watch for these meteors this year — at least for those watching from north of the equator.

The radiant (the emanation point of these meteors) is at the "water jar" of the constellation Aquarius, which comes above the southeast horizon around 3 a.m. local daylight time, never gets very high as seen from north temperate latitudes, so the actual observed rates are usually much lower than the oft-quoted 30 to 60 meteors per hour.

From North America, typical rates are 10 meteors per hour at 26-degrees north latitude (Brownsville, Texas; Naples, Fla.), half of this at 35-degrees latitude (Albuquerque, N.M.; Chattanooga, Tenn., and practically zero north of 40 degrees (Philadelphia, Penn.; Salt Lake City, Utah).

Catch an 'Earthgrazer'

For most, perhaps the best hope is perhaps catching a glimpse of a meteor emerging from the radiant that will skim the atmosphere horizontally — much like a bug skimming the side window of an automobile. Meteor watchers call such shooting stars "Earthgrazers." They leave colorful, long-lasting trails.

"These meteors are extremely long," said Robert Lunsford, of the International Meteor Organization. "They tend to hug the horizon rather than shooting overhead where most cameras are aimed."

"Earthgrazers are rarely numerous," advises Bill Cooke, a member of the Space Environments team at the Marshall Space Flight Center. "But even if you only see a few, you're likely to remember them."

Comet crumbs

If you do catch sight of one early these next few mornings, keep in mind that you'll likely be seeing the incandescent streak produced by material that originated from the nucleus of Halley's comet.

When these tiny bits of comet collide with Earth, friction with our atmosphere raises them to white heat and produces the effect popularly referred to as "shooting stars."

So it is that the shooting stars that we have come to call the Eta Aquarids are really an encounter with the traces of a famous visitor from the depths of space and from the dawn of creation.
Article by: Joe Rao
Source: Space.com

Tuesday, April 26, 2011

6.3-magnitude quake hits Indonesia

CILACAP, Indonesia (AFP) – A 6.3-magnitude earthquake hit Central Java on Tuesday, around 120 kilometres southwest of Cilacap at a depth of 24 kilometres (14.9 miles), according to local officials.

The local meteorology, climatology and geophysics agency said there was no tsunami alert but the quake was followed by an aftershock of 5.0 magnitude.

The US Geological Survey measured the original quake at a much weaker 5.4-magnitude and a depth of 78 kilometres (48 miles).

A disaster management official in Cilacap said that so far there was no report of damage from the area although it had caused panic.

"When the quake hit, we felt a strong tremor. Many people ran outside their houses," the official Suherman, who uses only one name said.

"Now the disaster management officials are trying to calm people here," he added.

An AFP reporter said there was no report of damage so far at a refinery belonging to state oil and gas firm Pertamina in Cilacap.

Indonesia sits on the Pacific "Ring of Fire", where the meeting of continental plates causes high seismic activity, and is frequently hit by earthquakes.
Source: Yahoo! News

Sunday, April 17, 2011

Satellite Photographs 'Black Hole' on Earth

A Korean satellite has caught an eye-catching view of an island in Mexico known for a deep, rocky hole and waters so dark that they earned it the name Holbox, a name that means "black hole."

The photo was taken by the Korea Multi-purpose Satellite 2, or Kompsat-2, and shows Holbox Island and its Yalahau lagoon at the northeast corner of Mexico's Yucatan Peninsula. [Photo of Earth's "black hole"]

Holbox Island is a 26-mile-long (42-kilometers) strip of land separated from the mainland by the lagoon.

"The freshwater lagoon has a deep rocky hole that surrounds the island, making the water appear black," officials with the European Space Agency, which is a partner in the Kompsat-2 mission, explained in a statement. "It is thought that Holbox, which in Mayan translates as 'black hole,' was named after the dark lagoon water."

Holbox Island is situated at an oceanic meeting point of sorts where the Atlantic Ocean, Gulf of Mexico and Caribbean converge. The mixing of these waters creates a nutrient-rich environment that supports an abundant array of marine life, ESA officials said. [The World's Biggest Oceans and Seas]

At Caboe Catoche, a cape at the eastern tip of the island, the mixing of the Caribbean and Gulf of Mexico creates a veritable kaleidoscope of watery turquoise and emerald colors.

Because of its host of marine life, Holbox Island and its surrounding waters are protected as part of the Yum Balam Biosphere Reserve. The island's beaches of white coralline sand serve as a vital home for turtle nests and more than 500 species of birds, while dolphins, manta rays and several shark species swim offshore.

The region is also home to the world’s largest known gathering of whale sharks — the largest fish on the planet — for five months of the year, ESA officials said.

The Kompsat-2 satellite has been snapping photos of Earth from orbit since it launched into space in 2006. The satellite was built for the Korea Aerospace Research Institute to provide uninterrupted Earth observation coverage following its predecessor, Kompsat-2.

ESA serves as a third-party partner in the mission and uses ground-based infrastructure to receive, process and distribute the images from Kompsat-2.
This article was provided by OurAmazingPlanet, a sister site to SPACE.com.
Source: Yahoo! News

At least 35 dead in 6 states after storm's rampage

RALEIGH, N.C. – A furious storm system that kicked up tornadoes, flash floods and hail as big as softballs has claimed at least 35 lives on a rampage that began in Oklahoma days ago, then smashed across several Southern states as it reached a new and deadly pitch in North Carolina and Virginia.

Emergency crews searched for victims in hard-hit swaths of North Carolina, where 62 tornadoes were reported from the worst spring storm in two decades to hit the state. Ten people were confirmed dead in Bertie County, county manager Zee Lamb said. At least three deaths were reported in Virginia. Authorities warned the toll was likely to rise further Sunday as searchers probed shattered homes and businesses.

The storm claimed its first lives Thursday night in Oklahoma, then roared through Arkansas, Mississippi, Alabama and Georgia. Seven people each were killed in Arkansas and Alabama, two people in Oklahoma and one person in Mississippi, authorities have said.

In North Carolina, Gov. Beverly Perdue declared a state of emergency after reporting fatalities in at least four counties. But she declined to immediately confirm an exact number of deaths. She said the 62 tornadoes reported were the most since March 1984, when a storm system spawned 22 twisters in the Carolinas that killed 57 people — 42 in North Carolina — and injured hundreds.

"Our thoughts and prayers are with everybody in North Carolina who has been through this horrible day," Perdue said.

Daybreak brought news of a horrific death toll in Bertie County, a place of about 21,000 people about 130 miles east of Raleigh. The tornado moved through about 7 p.m. Saturday, sweeping homes from their foundations, demolishing others and flipping cars on tiny rural roads between Askewville and Colerian, Lamb said.

One of the volunteers who scoured the rubble was an Iraq war veteran who told Lamb he was stunned by what he saw.

"He did two tours of duty in Iraq and the scene was worse than he ever saw in Iraq — that's pretty devastating," Lamb said.

As dawn broke, dozens of firefighters, volunteers and other officials were meeting in a makeshift command center to form search teams to fan out to the hardest-hit areas.

"There were several cases of houses being totally demolished except for one room, and that's where the people were," he said. "They survived. Pretty devastating."

Authorities in North Carolina said they would provide more details of the death toll later Sunday after checking on the reports of fatalities in at least four counties and in the capital city of Raleigh. Search and rescue teams operated through the night, Perdue said, with damage assessments starting in earnest Sunday after daylight.

"There's a lot of work that needs to be done in these areas that are most heavily impacted," said Doug Hoell, the state's director of emergency management. "There's a lot of debris out there that's got to be cleaned up."

In Virginia, disaster officials said one apparent tornado ripped across more than 12 miles through Gloucester County, uprooting trees and pounding homes to rubble while claiming three lives. Another person was confirmed dead and another remained missing early Sunday after flash flooding elsewhere in Virginia.

Scenes of destruction across the South looked eerily similar in many areas.

In North Carolina, rooftops were ripped off stores, trees were plucked from the ground and scores of homes were damaged, Hoell said.

At one point, more than 250,000 people went without power in North Carolina before emergency utility crews began repairing downed lines. But scattered outages were expected to linger at least until Monday.

Among areas hit by power outages was Raleigh, a bustling city of more than 400,000 people where some of the bigger downtown thoroughfares were blocked by fallen trees early Sunday.

Police and rescue crews began conducting house-to-house searches later Saturday at a mobile home park in north Raleigh, where the storm snapped some trees in half, ripped others out of the ground and tossed some trailers from one side of a street to the other.

In Sanford, about 40 miles southwest of Raleigh, a busy shopping district was pummeled by the storms, with some businesses losing rooftops in what observers described as a ferocious tornado. The Lowe's Home Improvement Center in Sanford looked flattened, with jagged beams and wobbly siding sticking up from the pancaked entrance. Cars in the parking lot were flipped by the winds.

"It's very, very bad here," said Monica Elliott, who works at the nearby Brick City Grill. "We saw a tornado that just rode up over the restaurant."

Remarkably, no one was seriously injured at the Lowe's, thanks to a quick-thinking manager who herded more than 100 people into a back area with no windows to shatter.

"It was really just a bad scene," said Jeff Blocker, Lowe's regional vice president for eastern North Carolina. "You're just amazed that no one was injured."

Cindy Hall, a Red Cross volunteer and outreach minister at First Baptist Church in Sanford, said dozens of homes in the area were damaged.

"It wiped out our St. Andrews neighborhood, which includes about 30 homes," she said.

To the west, hikers stranded by flash floods had to be rescued.

In Virginia, Department of Emergency Management spokesman Bob Spieldenner, said an apparent tornado ploughed through communities of Gloucester County, destroying or damaging homes, uprooting trees in a quiet farming and fishing region along the Chesapeake Bay.

"I know it was a pretty long path," he said of the reported tornado. "They estimated it was 12 to 14 miles" based on 911 emergency calls.

Authorities said at least three deaths had been confirmed in Gloucester County and at least 60 were injured, most with minor injuries. Spieldenner said one person was killed when a vehicle ran into flash flooding near Waynesboro. Another person was missing and a third rescued.

He reported homes and mobile homes damaged and destroyed in a series of other Virginia counties and flash flooding west of Charlottesville that prompted water rescues — including four people rescued unhurt from a car that had plunged into deep water flowing over a street.

___
Associated Press writers Page Ivey in Columbia, S.C., Jackie Quinn in Washington, D.C., and Jeff Martin and Jacob Jordan in Atlanta contributed to this report.
Source: Yahoo! News

April's Full Moon Arrives Sunday With Easter Name


Astronaut Paolo Nespoli took this image of the moon aboard the International Space Station on March 20, 2011, and wrote, "#Supermoon was spectacular from here!"
Sunday (April 17) brings us the first full moon of the new spring season in the Northern Hemisphere, bringing a lunar delight named – in part – for Easter.

The official moment that the moon will turn full is 10:44 p.m. EDT (7:44 p.m. PDT). Traditional names for the full moons of the year are found in some publications such as The Farmers' Almanac and we published the complete list on SPACE.com earlier this year.

The origins of these names have been traced back to native America, though they may also have evolved from old England or, as Guy Ottewell, editor of the annual publication, "Astronomical Calendar" suggests, "writer's fancy."

Traditionally, the April full moon is known as the "Pink Moon,"supposedly because the grass pink or wild ground phlox is one of the earliest widespread flowers of the spring. Other monikers were the Full Sprouting Grass Moon, the Egg Moon, and – among coastal tribes – the Full Fish Moon, when the shad come upstream to spawn. ['Supermoon' Photos from Around the World]

Easter's full moon twist
The first full moon of spring, however, is usually designated as the Paschal Full Moon or the Paschal Term. Traditionally, Easter is observed on the Sunday after the Paschal Full Moon. So if the Paschal Moon occurs on a Sunday, Easter is the following Sunday.

Following these celestial rules, we find that Easter can fall as early as March 22 and as late as April 25.

Pope Gregory XIII decreed this in 1582 as part of the Gregorian calendar. So according to the current ecclesiastical rules Easter in 2011 is to be celebrated nearly as late as it can come, on April 24.

Interestingly however, these rules also state that the vernal equinox is fixed on March 21, even though at European longitudes from the years 2008 through 2101 the equinox will occur no later than March 20.

Hence, there can sometimes be discrepancies between the ecclesiastical and astronomical versions for dating Easter.

In the year 2038, for instance, the equinox falls on March 20 with a full moon the next day, so astronomically speaking, Easter should fall on March 28 of that year. In reality, however, as mandated by the rules of the Church, Easter in 2038 will be observed as late as it can possibly come, on April 25!

Adding additional confusion is that there is also an "ecclesiastical" full moon, determined from ecclesiastical tables and whose date does not necessarily coincide with the "astronomical" full Moon, which is based solely on astronomical calculations. [Infographic: Earth’s Moon Phases Explained]

In 1981, for example, the full moon occurred on Sunday, April 19, so Easter should have occurred on the following Sunday, April 26. But based on the ecclesiastical full Moon it occurred on the same day of the Full Moon, April 19!

So, in practice, the date of Easter is determined not from astronomical computations, but rather from other formulae such as Epachs and Golden Numbers.

Since the beginning of the 20th century, a proposal to change Easter to a fixed holiday rather than a movable one has been widely circulated, and in 1963 the Second Vatican Council agreed, provided a consensus could be reached among Christian churches. The second Sunday in April has been suggested as the most likely date.
Spring Counterpart to the Harvest Moon
Traditionally the full moon ccurring nearest to the autumnal equinox is traditionally called the Harvest Moon. What sets the Harvest Moon apart from the others is that instead of rising at its normal average of 50 minutes later each day, it seems to rise at nearly the same time for several nights.

But in direct contrast to the Harvest Full Moon, the Paschal Full Moon appears to rise considerably later each night. Below we’ve provided some examples for ten North American cities.

The local moonrise times for April 16, 17, 18 are provided, the middle date being that of the Paschal Full moon.


This table shows moonrise times for April 16-18, 2011, at North American locations.
CREDIT: Joe Rao
Although normally the moon rises about 50 minutes later each night, over this three-night interval for our relatively small sampling, we can see that the rising of the moon comes, on the average, 77 minutes later each night.

A quick study of the table shows that the night-to-night difference is greatest for the more northerly locations (Edmonton, located at latitude 53.6 degrees north, sees moonrise come a full 90 minutes later on average). Meanwhile, the difference is less at southerly locations (at Miami, Florida located at latitude 26ºN, the average difference is about 68 minutes).

The reason for this seasonal circumstance is that the moon appears to move along the ecliptic and at this time of year when rising, the ecliptic makes its largest angle with respect to the horizon for those living in the Northern Hemisphere.

In contrast, for those living in the Southern Hemisphere, the ecliptic at this time of year appears to stand at a more oblique angle to the eastern horizon. As such, the difference for the time of moonrise is noticeably less than the average of 50 minutes per night. In Sydney, Australia, for instance, the night-to-night difference amounts to just 40 minutes.

Some final thoughts
For all who are making preparations for the upcoming Easter holiday, here's something to consider: Last month, had the moon officially turned full just 29 hours 50 minutes later than it actually did, it would have been designated as the Paschal Moon and Easter would have already occurred on March 27.

And while much ado was made about the near coincidence of last month's full moon with perigee (the closest point in its orbit relative to earth) the full moon of April 17 also occurs close to perigee.

In this case, perigee occurs about 21 hours before the moon turns full. Its distance from Earth: 222,506 miles (358,090 kilometers) is less than a half percent more distant than last month’s so-called "Super" moon. So, as was the case last month, the April full moon will appear to loom abnormally large when it rises or sets and will cause the daily range of ocean tides to be more extreme for a few days after full moon.

It’s just not considered a "super" moon. Go figure …

So while this April full moon wins the title of Paschal Moon by a margin of less than 30 hours, it falls short of being called a "Super" moon by just 941 miles (1,515 km); a distance that measures less than half of the diameter of the moon itself!
Source: Space.com

NASA Photos Bring Millions of Galaxies and Asteroids Down to Earth


When viewed in infrared light, NASA's Wide-field Infrared Survey Explorer, or WISE, shows a giant nebula around Lambda Orionis, inflating Orion's head to huge proportions.
CREDIT: NASA/JPL-Caltech/UCLA
NASA has unveiled a flood of photos showing millions galaxies, stars and asteroids photographed by a prolific sky-mapping telescope that ended its mission earlier this year.

For the first time, the space agency publicly released more than half of the 2.7 million images taken by its Wide-field Infrared Survey Explorer (WISE) telescope during its mission to map the entire sky.

WISE launched in December 2009 and spent 14 months scanning the heavens in infrared light before shutting down this past February. The $320 million space telescope hunted for asteroids and comets, as well as more distant cosmic objects revealed by their faint glow. [Photos from NASA's WISE Telescope]

WISE's infrared eyes were especially useful for peering through dense layers of dust to capture stunning space photos of previously unseen objects in unprecedented detail.

The telescope's observations have been used by mission scientists since they first started rolling in, but this is the first time a large amount of the data collected by WISE is being opened to the public, including scientists not affiliated with the project. Researchers are expecting the broadened exposure of the photos will enable a new wave of scientific discoveries.

"Starting today thousands of new eyes will be looking at WISE data, and I expect many surprises," the mission's principal investigator Edward (Ned) Wright, of UCLA, said in a statement.

While circling the Earth in a polar orbit, WISE captured images of faraway galaxies and nearby asteroids. During its tenure, the telescope surveyed the entire sky about 1 1/2 times in four different wavelengths of light.

WISE discovered 20 new comets, more than 33,000 asteroids between Mars and Jupiter, and 133 near-Earth objects (NEOs), which are asteroids that come within 28 million miles (about 45 million kilometers) of Earth.

The data released today includes about 57 percent of the photos taken by WISE over the course of its mission, NASA officials said. The remaining images will be released to an online archive in the spring of 2012.

"We are excited that the preliminary data contain millions of newfound objects," said Fengchuan Liu, the project manager for WISE at NASA's Jet Propulsion Laboratory in Pasadena, Calif. "But the mission is not yet over — the real treasure is the final catalog available a year from now, which will have twice as many sources, covering the entire sky and reaching even deeper into the universe than today's release."

So far, the WISE mission has released dozens of colorful images of the cosmos, in which infrared light has been assigned colors we see with our eyes. The whole collection can be seen at http://wise.ssl.berkeley.edu/gallery_images.html.

The public archive for astronomers is online at http://wise2.ipac.caltech.edu/docs/release/prelim/index.html. Instructions for astronomy enthusiasts wanting to try their hand at using the archive are at http://wise.ssl.berkeley.edu/wise_image_service.html.
Source: Space.com

Rare Sight: Mercury to Meet Mars at Dawn on Tuesday


The planets Mercury and Mars will be in close conjunction on the morning of April 19.
CREDIT: Starry Night Software
Skywatchers set your alarm clocks: On Tuesday morning (April 19), Mercury will appear to have a close encounter with Mars.

In reality, the two planets will actually be separated by about 161 million miles (259 million kilometers), but in Earth’s sky they will appear only 2 degrees (which is about four moon widths) apart. You'll need to be up just before the sun, around 6:30 a.m. local time, to see this rare sight.

Mercury and Mars will appear very low in the eastern sky and will be difficult to see in morning twilight. You will need a very low eastern horizon, with few obstacles in the way.

Small binoculars will be a big help in spotting the two tiny specks of light, but first make sure the sun is safely behind a hilltop or other obstruction, as in this sky map of Mars and Mercury.

You can also use the much brighter planets Venus and Jupiter to locate Mercury and Mars.

To ancient astrologers, such conjunctions were fraught with ominous significance. To modern astronomers, they are merely a pretty sight, a photo opportunity. [Latest Mercury photos from NASA probe]

This is the first of a whole series of close encounters between six planets in the morning sky over the next two months. Saturn won’t participate in the dawn dance, since it is currently dominating the evening sky.

Here is a run-down of these upcoming conjunctions:
April 19: Mercury and Mars
April 22: Venus and Uranus
May 1: Mars and Jupiter
May 8: Mercury and Venus
May 10: Mercury and Jupiter
May 11: Venus and Jupiter
May 18: Mercury and Venus (again)
May 20: Mercury and Mars (again)
May 22: Venus and Mars

Because of its rapid motion relative to the sun, Mercury manages two conjunctions each with both Venus and Mars. In addition, the waning crescent moon will pass through the gathering of planets in late April and again in late May.

Neptune is the only dawn planet not to be involved in a conjunction, because it is too far to the west.

These planet conjunctions offer many opportunities for beautiful photographs with ordinary cameras.

Use your lens at its longest telephoto setting, underexpose slightly to bring out the colors of the dawn sky, and try to frame the planets with the silhouettes of foreground objects.
Article by: Starry Night Education, the leader in space science curriculum solutions.

Source: Space.com

Wednesday, April 13, 2011

Yellowstone Supervolcano Bigger Than Thought

The gigantic underground plume of partly molten rock that feeds the Yellowstone supervolcano might be bigger than previously thought, a new image suggests.

The study says nothing about the chances of a cataclysmic eruption at Yellowstone, but it provides scientists with a valuable new perspective on the vast and deep reservoir of fiery material that feeds such eruptions, the last of which occurred more than 600,000 years ago. [Related: Infographic - The Geology of Yellowstone.]

Earlier measurements of the plume were produced by using seismic waves — the waves generated by earthquakes — to create a picture of the underground region. The new picture was produced by examining the Yellowstone plume's electrical conductivity, which is generated by molten silicate rocks and hot briny water that is naturally present and mixed in with partly molten rock.

"It’s a totally new and different way of imaging and looking at the volcanic roots of Yellowstone," said study co-author Robert B. Smith, professor emeritus and research professor of geophysics at the University of Utah, and a coordinating scientist of the Yellowstone Volcano Observatory.

Ancient eruptions
Almost 17 million years ago, the deep plume of partly molten rock known as the Yellowstone hot spot first breached the surface in an eruption near what is now the Oregon-Idaho-Nevada border.

As North America drifted slowly southwest over the hot spot, there were more than 140 gargantuan caldera eruptions — the largest kind of eruption on Earth — along a northeast-trending path that is now Idaho's Snake River Plain.

The hot spot finally reached Yellowstone about 2 million years ago, yielding three huge caldera eruptions about 2 million, 1.3 million and 642,000 years ago.

Two of the eruptions blanketed half of North America with volcanic ash, producing 2,500 times and 1,000 times more ash than the 1980 eruption of Mount St. Helens in Washington state. Smaller eruptions occurred at Yellowstone in between the big blasts and as recently as 70,000 years ago.

Underground images
Smith said the geoelectric and seismic images of the Yellowstone plume look somewhat different because "we are imaging slightly different things." Seismic images highlight materials such as molten or partly molten rock that slow seismic waves, while the geoelectric image is sensitive to briny fluids that conduct electricity.

Seismic images of the plume made by Smith in 2009 showed the plume of molten rock dips downward from Yellowstone at a 60-degree angle and extends 150 miles (240 kilometers) west-northwest to a point at least 410 miles (660 km) under the Montana-Idaho border — as far as seismic imaging could "see."

The new electrical conductivity images show the conductive part of the plume dipping more gently, at an angle of perhaps 40 degrees to the west, and extending perhaps 400 miles (640 km) from east to west. The geoelectric image can "see" to a depth of only 200 miles (320 km).

The lesser tilt of the geoelectric plume image raises the possibility that the seismically imaged plume, shaped somewhat like a tilted tornado, may be enveloped by a broader, underground sheath of partly molten rock and liquids, Zhdanov and Smith say.

"It's a bigger size" in the geoelectric picture, Smith said. "We can infer there are more fluids" than shown by seismic images. Despite differences, he said, "this body that conducts electricity is in about the same location with similar geometry as the seismically imaged Yellowstone plume."

The new study has been accepted for publication in Geophysical Research Letters, a journal of the American Geophysical Union, which plans to publish it within the next few weeks.
Image Gallery: Yellowstone and Yosemite
Infographic: Tallest Mountain to Deepest Ocean Trench
Which U.S. Volcanoes Are Most Dangerous Right Now?
This article was provided by OurAmazingPlanet, a sister site to LiveScience.
Source: Yahoo! News

Friday, April 8, 2011

The Moon Visits Two Star Clusters in Night Sky



Over the next few days, the moon will move past two of the prettiest star clusters in the sky.

Tonight (April 6) the moon will be located just below the brightest star cluster we can see from Earth — the Pleiades, which is found in the constellation Taurus. By Saturday, the moon will nearing another nice cluster, known as Messier 35.

The Pleiades cluster has been known since antiquity by nearly every culture around the world. It is best known as the Pleiades or the Seven Sisters, even though only six of its stars are readily visible with the naked eye.

This sky map of the moon and star clusters shows how they will appear together this week.

Not the Little Dipper
Beginning stargazersoften mistake the Pleiades for the Little Dipper, because it is dipper-shaped and much brighter than the real Little Dipper. In Japanese, the cluster is known as Subaru, and the Japanese automakeruses a picture of the Pleiades as its logo. In Australia, the Pleiades are known as “the Shopping Cart.”

Tonight, the Pleiades are easily seen just above the thin waxing crescent moon. By Thursday, the moon will have moved so that it is above and to the left of the Pleiades. The cluster will be readily visible with the naked eye on both nights, though it looks even better in binoculars or a small telescope. With either of those vision aids, hundreds of stars in this cluster become visible.

By Saturday night (April 9) the moon will have moved on from Taurus into Gemini, and it will be near another fine cluster. This one has no name, only a number in the famous catalog compiled by Charles Messier: Messier 35 (or M35 for short).

Charles Messier was an eminent hunter of comets in the 18th century. To make identification of comets easier, he compiled a list of permanent objects in the sky that look somewhat like comets. His list contains 110 objects that represent the brightest and best deep-sky objects in the heavens: star clusters, nebulae and galaxies.

Observing his list has become a popular project for amateur astronomers, who attempt to spot all 110 objects Messier saw. In the process, they learn what deep-sky objects look like, and how to find their way around the sky.

Messier 35
Messier first observed the M35 cluster on August 30, 1764. This cluster has many more stars than the Pleiades, but is seven times farther away from us — 2,850 light-years as opposed to 410 light-years for the Pleiades. In binoculars it just appears as a dim glow; it takes a small telescope to resolve it into stars.

The Pleiades are also in Messier’s catalog as Messier 45, but he did not discover that cluster. When he was about to publish his catalog for the first time, Mesier added a few well-known objects to pad its numbers up to 45, including the Orion Nebula (Messier 42 and 43), the Beehive Cluster (Messier 44) and the Pleiades (Messier 45).

Some years later, Messier published a larger catalog of 103 objects, and noted in his personal copy six more, bringing the total to 109. In recent years, astronomers have added a last object to bring the total to an even 110 objects. This last object is one of the two satellite galaxies of the Andromeda Galaxy (Messier 31), which Messier observed and drew, but never assigned a number.
This article was provided to SPACE.com by Starry Night Education, the leader in space science curriculum solutions.
Source: Space.com

Strongest aftershock since Japan tsunami kills 2

By JAY ALABASTER and TOMOKO A. HOSAKA
Associated Press
SENDAI, Japan (AP) -- A strong aftershock ripped through northeastern Japan, killing two people, knocking out power to vast areas Friday and piling misery on a region still buried under the rubble of last month's devastating tsunami.

The northeastern coast was still reeling from the destruction wrought by a jumbo 9.0-magnitude earthquake on March 11, with tens of thousands of households without power or water. The 7.1 tremor has now thrown even more areas into disarray and sent communities that had made some gains back to square one.

Gasoline that had become more available after weeks of shortages was scarce again, and long lines formed at stations. Stores that had restocked shelves sold out of basics Friday and were forced to ration purchases again.

Still, the latest quake did far less damage, generated no tsunami and largely spared the region's nuclear plants. Some slightly radioactive water spilled at one plant, but the tsunami-crippled Fukushima Dai-ichi complex reported no new problems.

Matsuko Ito, who has been living in a shelter in the small northeastern city of Natori since the tsunami, said there's no getting used to the terror of being awoken by shaking. She said she started screaming when the quake struck around 11:30 p.m.

"It's enough," the 64-year-old while smoking a cigarette outside. "Something has changed. The world feels strange now. Even the way the clouds move isn't right."

The latest tremor sunk more homes into blackness, though power was quickly restored to many. About 950,000 households were still dark Friday evening, said Souta Nozu, a spokesman for Tohoku Electric Power Co., which serves northern Japan. That includes homes in prefectures in Japan's northwest that had been spared in the first quake.

Six conventional plants in the area were knocked out, though three have since come back online and the others should be up again within hours, Nozu said. But with power lines throughout the area damaged, it was not clear whether normal operations would be restored, he said.

In Ichinoseki, lines formed outside a supermarket when it opened Friday morning. An employee with a flashlight escorted each customer around the store and jotted the price of each selected item in a pad.

Most businesses were closed in the city, 240 miles (390 kilometers) northeast of Tokyo. One restaurant owner, Suzuki Koya, bought a small gas stove and made free meals in big boiling pot.

"I saw the meat at the supermarket and I thought, 'We should do a hot pot,' " the 47-year-old said. "It's good to keep warm in times like these."

Several nuclear power plants briefly switched to diesel generators but were reconnected to the grid by Friday afternoon. One plant north of Sendai briefly lost the ability to cool its spent fuel pools, but quickly got it back.

At a plant in Onagawa, some radioactive water splashed out of the pools but did not leave a containment building, Tohoku Electric said. Such splash-out is "not unusual, although it is preferable that it doesn't happen," according to Japanese nuclear safety agency official Tomoho Yamada.

"Closer inspection could find more problems," said agency spokesman Hidehiko Nishiyama, but no radiation was released into the environment at Onagawa.

The plant began leaking oil into the ocean in the first earthquake, and the flow escaped a containment boom in Thursday's tremor but was contained again by Friday, coast guard spokesman Hideaki Takase said.

Thursday's quake prompted a tsunami warning of its own, but it was later canceled. Two people were killed, national fire and disaster agency spokesman Junichi Sawada reported Friday. A 79-year-old man died of shock and a woman in her 60s was killed when power was cut to her oxygen tank. More than 130 people were injured, according to the national police agency.

That pales in comparison to the original quake and tsunami, in which more than 25,000 people are believed to have died.

Many of those bodies have still not been found: A significant portion were likely washed out to sea and never will be, but some are buried in areas that have been largely off-limits to search teams.

As radiation spilling from the troubled Fukushima Dai-ichi plant has fallen in recent days, however, police have fanned out inside a no-go zone near the complex to dig for the dead.

On Friday, hundreds of police, many mobilized from Tokyo, used their hands or small shovels, pulling four bodies in an hour from one small area in the city of Minami Soma. The had found only five bodies the previous day.

The searchers, wearing white radiation gear and blue gloves, struggled to bring the remains across the rubble to vans and minibuses that would take them to the nearest morgue. Each body was carefully hosed off to rid it of radiation before being placed in the vehicles.

"The area is literally a mountain of debris. It is an extremely difficult task," said an official with police in Fukushima prefecture who declined to be named because he was not authorized to talk to the media.

The epicenter of Thursday's temblor was in about the same location as the original 9.0-magnitude tremor, off the eastern coast and about 40 miles (65 kilometers) from Sendai, an industrial city on the eastern coast, according to the U.S. Geological Survey. It was strong enough to shake buildings for about a minute as far away as Tokyo, about 200 miles (330 kilometers) away.

At a Toyota dealership in Sendai, most of a two-story show window was shattered, and thick shards of glass were heaped in front of the building. Police directed cars through intersections throughout the city on Friday because traffic lights were out. Small electrical fires were reported.

At the Fukushima Dai-ichi plant, where nuclear workers have been toiling to plug radiation leaks and restore cooling systems ruined in the March 11 quake and tsunami, workers briefly retreated to a shelter and suffered no injuries. The plant operator said the tremor caused no new problems there.

Despite the new aftershock, automakers announced Friday that they were beginning to bounce back from the March monster. Toyota will resume car production at all its plants in Japan at half capacity from April 18 to 27.

The world's No. 1 automaker said it remained unclear when it would return to full production in Japan.

Nissan also said it would start up domestic production at half capacity from April 11.

Operations had been halted at both companies because of part shortages.
Associated Press writers Shino Yuasa, Malcolm Foster, Ryan Nakashima, Mari Yamaguchi and Cara Rubinsky in Tokyo, Eric Talmadge in Minami Soma, and Colleen Slevin in Denver contributed to this report.
Article by: Associated Press