SpaceX's Falcon 9 rocket sits on the launch pad Saturday at Kennedy Space Center in Florida. SpaceX scrubbed the Saturday launch due to a technical issue. The company is tried again — and succeeded — on Sunday. Bruce Weaver/AFP/Getty Images hide caption

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Bruce Weaver/AFP/Getty Images

Why NASA Is Exploring An Alien World In Antarctica

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An artist's concept shows the WISE spacecraft in its orbit around Earth. NASA/JPL-Caltech hide caption

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NASA/JPL-Caltech

Have Spare Time? Try To Discover A Planet

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SpaceX's Falcon 9 rocket is prepared Friday for a launch at the Kennedy Space Center in Florida. Launch Pad 39A, one of the renovated space shuttle launch pads that SpaceX leases from NASA, has been the site of many of NASA's most famous liftoffs. Bruce Weaver/AFP/Getty Images hide caption

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Bruce Weaver/AFP/Getty Images

This image made by the NASA/ESA Hubble Space Telescope shows part of a group of five galaxies known as Stephan's Quintet. NASA, ESA, Hubble SM4 ERO Team /AP hide caption

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NASA, ESA, Hubble SM4 ERO Team /AP

'Are We Alone?' Churchill Concludes It's Likely Life Circles Other Suns

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Winston Churchill Ponders Extraterrestrial Life In Newly Discovered Essay

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This is the actual NASA graphic illustrating the "Space Poop Challenge." NASA hide caption

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NASA

Space Poop Problem-Solvers Take Home Cash Prizes From NASA

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Look Up! Astronomer Details Upcoming Trifecta Of Celestial Activity

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Astronauts May Hold Football Passing Record

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Moon Express Reaches Finals In Google Lunar Xprize Competition

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For years, the satellites that make up America's Global Position System have been carrying sensors that measure the weather in space. This image illustrates the orbital planes in which GPS satellites travel around Earth. Courtesy of Los Alamos National Laboratory hide caption

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Courtesy of Los Alamos National Laboratory