Nasa

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In this image provided by NASA the International Space Station is shown with the backdrop of Earth. The image was photographed by an STS-132 crew member on space shuttle Atlantis after the station and shuttle began their post-undocking relative separation on May 23, 2010. The astronauts aboard the International Space Station dimmed the lights, turned off unnecessary equipment and put off science work Thursday Dec. 12, 2013 as NASA scrambled to figure out what's wrong with one of two identical cooling loops that shut down Wednesday. (AP Photo/NASA)

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Valkyrie is NASA's "superhero robot." (YouTube)

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The Mars rover Curiosity, pictured here in a self-portrait, has uncovered signs of an ancient freshwater lake on the red planet that may have teemed with microbes for tens of millions of years, far longer than scientists had imagined, new research suggests. (AP Photo/NASA)

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Comet ISON (left) approaches the sun on Monday, Nov. 25, 2013, in this frame grab taken from enhanced video made by NASA's STEREO-A spacecraft. (AP Photo/NASA)

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Kepler-22b This artist's conception illustrates Kepler-22b, a planet known to comfortably circle in the habitable zone of a sun-like star Credit: NASA/Ames/JPL-Caltech

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In this still image taken from video posted by NASA on Tuesday, Nov. 26, 2013, NASA astronauts Rick Mastracchio, left, and Mike Hopkins show some of the turkey and green bean casserole they plan to eat for their Thanksgiving meal in a video made aboard the Earth-orbiting International Space Station. “Though we miss our families, it’s great to be in space,” Hopkins said from 260 miles above Earth in the taped message. (AP Photo/NASA)