How much are you willing to pay to become an astronaut?
Who needs the space shuttle? Take a tour inside the private space industry and its innovative, efficient plans to get astronauts into space when NASA retires its old ride
A company aiming to open the first space hotel already has 43 paying customers at $4.4 million a pop
Scientists design a self-sustaining lunar habitat that would make Al Gore proud. See our interactive infographic inside
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