Nasa

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This image provided by the National Aeronautics and Space Administration shows Hurricane Earl (lower right) at 1 a.m. EDT on Wednesday, Sept. 1, 2010. At 11 p.m. EDT Tuesday the center of the storm was located about 910 miles south-southeast of Wilmington, N.C. The Category 4 hurricane was moving northwest at 15 mph with maximum sustained winds of 135 mph. (AP Photo/NASA)

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Hurricane Earl passes over the Leeward Islands on Monday, Aug. 30, 2010, in this image from the National Aeronautics and Space Administration. (AP Photo/NASA)

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FILE - This Thursday, Feb. 14, 2008 image provided by NASA shows astronaut Alan Poindexter exercising on a bicycle ergometer on the space shuttle Atlantis while docked with the International Space Station. Astronauts can become as weak as 80-year-olds after six months at the International Space Station, according to a new study that raises serious health concerns as NASA contemplates prolonged trips to asteroids and Mars. (AP Photo/NASA)

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In a photo made from NASA television, Expedition 24 astronaut Tracy Caldwell Dyson works outside the space station Monday Aug. 16, 2010 as she and Douglas Wheelock prepare to install a cooling pump module, replacing the one that failed. (AP Photo/NASA)

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This image provided by NASA of the Petermann Glacier and the new iceberg was acquired from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) instrument on NASA's Terra spacecraft on Thursday Aug. 12, 2010. It covers an area of 49.5 by 31.5 kilometers (30.7 by 19.5 miles), four times the size of New York's Manhattan island. According to scientists the recently calved iceberg is the largest to form in the Arctic in 50 years. (AP Photo/NASA)

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FILE - These two satellite images provided by NASA taken on July 28, 2010, left, and Aug. 5, 2010, right, shows the Petermann Glacier in Northern Greenland. A giant ice island, seen in image at right, has broken off the Petermann Glacier. A University of Delaware researcher says the floating ice sheet covers 100 square miles (260 sq. kilometers) _ more than four times the size of New York's Manhattan Island. The World Meteorological Organization (WMO) says the weather-related cataclysms of July and August fit patterns predicted by climate scientists, although those scientists always shy from tying individual disasters directly to global warming. (AP Photo/NASA)

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This image provided by the Alaska State Troopers shows the wreckage of the amphibious plane carrying former Sen. Ted Stevens and former NASA chief Sean O'Keefe that crashed into a remote Alaska mountainside during a fishing trip, killing Mr. Stevens and four others and stranding the survivors on a rocky, brush-covered slope overnight. The plane hit the ground with so much force that it left a 300-foot gash on the slope, federal investigators said. (AP Photo/Alaska State Troopers)

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This Aug. 5, 2010 satellite image provided by NASA shows an ice island that has broken off the Petermann Glacier in northern Greenland. A University of Delaware researcher says the floating ice sheet covers 100 square miles (260 sq. kilometers) _ more than four times the size of New York's Manhattan Island. (AP Photo/NASA)

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** FILE ** Former NASA Administrator Sean O'Keefe (The Washington Times)

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In this photo taken from NASA television, Expedition 24 astronauts work outside the space station, Monday, Aug. 16, 2010. (AP Photo/NASA)

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In this x-ray photo provided by NASA, the sun is shown early in the morning of Sunday, Aug. 1, 2010. The dark arc near the top right edge of the image is a filament of plasma blasting off the surface _ part of the coronal mass ejection. The bright region is an unassociated solar flare. When particles from the eruption reach Earth on the evening of Aug. 3-4, they may trigger a brilliant auroral display known as the Northern Lights. (AP Photo/NASA)

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NASA's muscular R2 astronaut "helper" robot has announced by Twitter that it has no gender. (NASA photo)

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FILE - This Feb. 19. 2010 file photo provided by NASA shows the International Space Station with Earth's horizon as a backdrop. Several power systems have been shut down aboard the International Space Station after a cooling system malfunctioned. NASA says in a posting on its website that one of two cooling loops aboard the space station was shut down Saturday, July 31, 2010. A module that pumps ammonia coolant to prevent equipment from overheating was still shut down early Sunday, Aug. 1. (AP Photo/NASA, File)