NASA's GRAIL mission could revolutionize our understanding of terrestrial planets.
NASA can't use real space shuttles to practice landings. See how astronauts practice landing 100-ton space planes.
The Robotic Refueling Mission is a novel experiment that will fly on Atlantis' upcoming STS-135 mission.
NASA?s 2011 Lunabotics competition saw 46 robots from around the world fighting to prove their worth by collect the most simulated moon rocks.
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