The blue star near the center of this image provided by NASA Monday Jan. 24, 2011 is Zeta Ophiuchi. When seen in visible light it appears as a relatively dim red star surrounded by other dim stars and no dust. However, in this infrared image taken with NASA’s Wide-field Infrared Survey Explorer, or WISE, a completely different view emerges. Zeta Ophiuchi is actually a very massive, hot, bright blue star plowing its way through a large cloud of interstellar dust and gas. (AP Photo/NASA)

The blue star near the center of this image provided by NASA Monday Jan. 24, 2011 is Zeta Ophiuchi. When seen in visible light it appears as a relatively dim red star surrounded by other dim stars and no dust. However, in this infrared image taken with NASA’s Wide-field Infrared Survey Explorer, or WISE, a completely different view emerges. Zeta Ophiuchi is actually a very massive, hot, bright blue star plowing its way through a large cloud of interstellar dust and gas. (AP Photo/NASA)

Russian cosmonaut Fyodor Yurchikhin smiles, center, as US astronauts Doug Wheelock, left, and Shannon Walker, right, sit alongside him inside the landing capsule of the Soyuz TMA-19 spacecraft after landing near the town of Arkalyk in northern Kazakhstan, Friday, Nov. 26, 2010. The Soyuz spacecraft carrying two Americans and a Russian from the International Space Station touched down Friday in a landing that the Russian space program’s chief described as ideal. (AP Photo/Shamil Zhumatov, pool) Read more →

Russian cosmonaut Fyodor Yurchikhin smiles, center, as US astronauts Doug Wheelock, left, and Shannon Walker, right, sit alongside him inside the landing capsule of the Soyuz TMA-19 spacecraft after landing near the town of Arkalyk in northern Kazakhstan, Friday, Nov. 26, 2010. The Soyuz spacecraft carrying two Americans and a Russian from the International Space Station touched down Friday in a landing that the Russian space program’s chief described as ideal. (AP Photo/Shamil Zhumatov, pool)

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The Soyuz TMA-19 spacecraft is seen as it descends with Expedition 25 Commander Doug Wheelock and Flight Engineers Shannon Walker and Fyodor Yurchikhin near the town of Arkalyk, Kazakhstan on Friday, Nov. 26, 2010. Russian Cosmonaut Yurchikhin and NASA Astronauts Wheelock and Walker, are returning from six months onboard the International Space Station where they served as members of the Expedition 24 and 25 crews. The crew worked in orbit for 162 days. (AP Photo/NASA - Bill Ingalls) Read more →

The Soyuz TMA-19 spacecraft is seen as it descends with Expedition 25 Commander Doug Wheelock and Flight Engineers Shannon Walker and Fyodor Yurchikhin near the town of Arkalyk, Kazakhstan on Friday, Nov. 26, 2010. Russian Cosmonaut Yurchikhin and NASA Astronauts Wheelock and Walker, are returning from six months onboard the International Space Station where they served as members of the Expedition 24 and 25 crews. The crew worked in orbit for 162 days. (AP Photo/NASA - Bill Ingalls)

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This image provided by NASA shows the Aurora Borealis taken from the International Space Station taken by astronaut Douglas Wheelock. A solar array from the station can be seen at top. NASA will again attempt to launch Space Shuttle Discovery no earlier than Dec. 3 at about 2:52 a.m. EST. (AP Photo/NASA)

This image provided by NASA shows the Aurora Borealis taken from the International Space Station taken by astronaut Douglas Wheelock. A solar array from the station can be seen at top. NASA will again attempt to launch Space Shuttle Discovery no earlier than Dec. 3 at about 2:52 a.m. EST. (AP Photo/NASA)

This black-and-white image of the comet Hartley 2 provided by NASA was sent from the NASA EPOXI Mission Deep Impact spacecraft, which passed within 435 miles (700 kilometers) of the comet at its closest point, and was received at Jet Propulsion Laboratory in Pasadena, California, Thursday, Nov. 4, 2010. The comet is estimated to be 1.4 miles (2.2 kilometers) long, and weigh about 280 million metric tons. (AP Photo NASA/JPL-Caltech/University of Maryland) Read more →

This black-and-white image of the comet Hartley 2 provided by NASA was sent from the NASA EPOXI Mission Deep Impact spacecraft, which passed within 435 miles (700 kilometers) of the comet at its closest point, and was received at Jet Propulsion Laboratory in Pasadena, California, Thursday, Nov. 4, 2010. The comet is estimated to be 1.4 miles (2.2 kilometers) long, and weigh about 280 million metric tons. (AP Photo NASA/JPL-Caltech/University of Maryland)

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In this Aug. 4, 2010 picture provided by NASA, NASA astronaut Michael Barratt, STS-133 mission specialist, shakes hands with Robonaut 2 during a news conference in the Space Vehicle Mock-up Facility at NASA’s Johnson Space Center in Houston. Ron Diftler, NASA Robonaut project manager, is at left. Robonaut 2 is hitching a one-way ride to the International Space Station on the final flight of the space shuttle Discovery scheduled for Wednesday, Nov. 3, 2010. NASA hopes one day he will assist flesh-and-bone astronauts in orbit. (AP Photo/NASA, Lauren Harnett)

In this Aug. 4, 2010 picture provided by NASA, NASA astronaut Michael Barratt, STS-133 mission specialist, shakes hands with Robonaut 2 during a news conference in the Space Vehicle Mock-up Facility at NASA’s Johnson Space Center in Houston. Ron Diftler, NASA Robonaut project manager, is at left. Robonaut 2 is hitching a one-way ride to the International Space Station on the final flight of the space shuttle Discovery scheduled for Wednesday, Nov. 3, 2010. NASA hopes one day he will assist flesh-and-bone astronauts in orbit. (AP Photo/NASA, Lauren Harnett)

This image provided by NASA Wednesday Oct. 20, 2010 shows the Moon passing between the Sun and the Solar Dynamics Observatory’s space telescope on Oct. 7, 2010. (AP Photo/NASA- SDO)

This image provided by NASA Wednesday Oct. 20, 2010 shows the Moon passing between the Sun and the Solar Dynamics Observatory’s space telescope on Oct. 7, 2010. (AP Photo/NASA- SDO)

The crew of space shuttle Discovery, from left, commander Steve Lindsey, pilot Eric Boe, mission specialist’s Alvin Drew, Tim Kopra, Michael Barratt and Nicole Stott attend a news conference in front of the shuttle on launch pad 39A at the Kennedy Space Center in Cape Canaveral, Fla., Thursday, Oct. 14, 2010. Discovery is scheduled to launch Nov. 1. (AP Photo/John Raoux)

The crew of space shuttle Discovery, from left, commander Steve Lindsey, pilot Eric Boe, mission specialist’s Alvin Drew, Tim Kopra, Michael Barratt and Nicole Stott attend a news conference in front of the shuttle on launch pad 39A at the Kennedy Space Center in Cape Canaveral, Fla., Thursday, Oct. 14, 2010. Discovery is scheduled to launch Nov. 1. (AP Photo/John Raoux)

In this photo released by Virgin Galactic, the Virgin Galactic SpaceShipTwo, VSS Enterprise, glides toward the earth on its first test flight after release from the mothership, WhiteKnight2, over the Mojave, California area early Sunday, Oct. 10, 2010. SpaceShipTwo is undergoing rigorous testing before it can carry tourists to space. In the latest test, SpaceShipTwo did not fire its rocket engine to climb to space. The craft was piloted by engineer and test pilot Pete Siebold from Scaled Composites. (AP Photo/Clay Observatory for Virgina Galactic)

In this photo released by Virgin Galactic, the Virgin Galactic SpaceShipTwo, VSS Enterprise, glides toward the earth on its first test flight after release from the mothership, WhiteKnight2, over the Mojave, California area early Sunday, Oct. 10, 2010. SpaceShipTwo is undergoing rigorous testing before it can carry tourists to space. In the latest test, SpaceShipTwo did not fire its rocket engine to climb to space. The craft was piloted by engineer and test pilot Pete Siebold from Scaled Composites. (AP Photo/Clay Observatory for Virgina Galactic)

This image provided by NASA Wednesday Sept. 1, 2010 shows sand dunes near the North pole of Mars where the landscape is dominated by sand dunes forming a massive erg (sand sea), much like parts of the Sahara Desert on Earth. In parts of the erg, sand is abundant and covers the entire surface. Here near the edge, sand is in shorter supply and the dunes are separated by areas of lighter-toned soil. The image was taken by the HiRISE camera on the Mars Reconnaissance Orbiter. (AP Photo/NASA)

This image provided by NASA Wednesday Sept. 1, 2010 shows sand dunes near the North pole of Mars where the landscape is dominated by sand dunes forming a massive erg (sand sea), much like parts of the Sahara Desert on Earth. In parts of the erg, sand is abundant and covers the entire surface. Here near the edge, sand is in shorter supply and the dunes are separated by areas of lighter-toned soil. The image was taken by the HiRISE camera on the Mars Reconnaissance Orbiter. (AP Photo/NASA)

This image provided by NASA shows Hurricane Earl taken by astronaut Douglas Wheelock aboard the International Space Station and posted Aug. 31, 2010. Earl was expected to remain over the open ocean before turning north and running parallel to the East Coast, bringing high winds and heavy rain to North Carolina’s Outer Banks by late Thursday or early Friday. (AP Photo/NASA) Read more →

This image provided by NASA shows Hurricane Earl taken by astronaut Douglas Wheelock aboard the International Space Station and posted Aug. 31, 2010. Earl was expected to remain over the open ocean before turning north and running parallel to the East Coast, bringing high winds and heavy rain to North Carolina’s Outer Banks by late Thursday or early Friday. (AP Photo/NASA)

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This artist’s impression made available by the European Southern Observatory Tuesday, Aug. 24, 2010, shows the remarkable planetary system around the Sun-like star HD 10180. Observations with the HARPS spectrograph, attached to ESO’s 3.6-metre telescope at La Silla, Chile, have revealed the definite presence of five planets and evidence for two more in orbit around this star. This system is similar to the Solar System in terms of number of planets and the presence of a regular pattern in the sizes of the orbits. If confirmed the closest planet detected would be the lightest yet known outside the Solar System, with a mass that could be only about 1.4 times that of the Earth. (AP Photo/ESO, L. Calcada) Read more →

This artist’s impression made available by the European Southern Observatory Tuesday, Aug. 24, 2010, shows the remarkable planetary system around the Sun-like star HD 10180. Observations with the HARPS spectrograph, attached to ESO’s 3.6-metre telescope at La Silla, Chile, have revealed the definite presence of five planets and evidence for two more in orbit around this star. This system is similar to the Solar System in terms of number of planets and the presence of a regular pattern in the sizes of the orbits. If confirmed the closest planet detected would be the lightest yet known outside the Solar System, with a mass that could be only about 1.4 times that of the Earth. (AP Photo/ESO, L. Calcada)

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This photo provided by Team TechShop NC shows the view from near space above central North Carolina. The photo was taken by a homemade balloon launched from Raleigh, North Carolina, Sunday, Aug. 22, 2010 by Team TechShop. The balloon soared to 80,000 feet and took dozens of photos of the Earth’s horizon and the blackness of space before it landed in a tree in Rocky Mount, N.C. (AP Photo/Team TechShop NC) Read more →

This photo provided by Team TechShop NC shows the view from near space above central North Carolina. The photo was taken by a homemade balloon launched from Raleigh, North Carolina, Sunday, Aug. 22, 2010 by Team TechShop. The balloon soared to 80,000 feet and took dozens of photos of the Earth’s horizon and the blackness of space before it landed in a tree in Rocky Mount, N.C. (AP Photo/Team TechShop NC)

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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, residents of northern regions — from Maine to Michigan and anywhere farther north around the globe — may see a brilliant auroral display known as the Northern Lights. Usually only regions closer to the Arctic can see the aurora of rippling reds and greens, but solar storms pull them south. (AP Photo/NASA) Read more →

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, residents of northern regions — from Maine to Michigan and anywhere farther north around the globe — may see a brilliant auroral display known as the Northern Lights. Usually only regions closer to the Arctic can see the aurora of rippling reds and greens, but solar storms pull them south. (AP Photo/NASA)

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The external fuel tank for the last scheduled space shuttle flight is transported to the Vehicle Assembly Building, back right, at the Kennedy Space Center in Cape Canaveral, Florida, Wednesday, July 14, 2010. The tank is designated for space shuttle Endeavour’s STS-134 mission scheduled to launch in Feb. 2011. (AP Photo/John Raoux)

The external fuel tank for the last scheduled space shuttle flight is transported to the Vehicle Assembly Building, back right, at the Kennedy Space Center in Cape Canaveral, Florida, Wednesday, July 14, 2010. The tank is designated for space shuttle Endeavour’s STS-134 mission scheduled to launch in Feb. 2011. (AP Photo/John Raoux)