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December 13, 2012 Commercial space travel is becoming a reality. Now people who have longed to go into space can buy a ticket, if they've got the cash. But are they healthy enough to make the voyage?

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December 13, 2012 Given the history of first orbital space shots, North Korea's apparent struggle with its mission is fairly typical, experts say.

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December 7, 2012 It's been 40 years since NASA launched Apollo 17, its final human mission to the moon. The commander of that mission says he'd love to give up his claim to fame as "the last man on the moon" but concedes that it probably won't happen in his lifetime. And future trips might be run by companies in the private sector.

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On Morning EditionPlaylist

• INTERACTIVE: A Lunar 360

December 5, 2012 "The night is nowhere as dark as we might think," says one scientist. How does your location light up the night?

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December 3, 2012 NASA believes its Curiosity rover might have found carbon and chlorine molecules on the red planet. But before anyone says "life on Mars," NASA needs more testing to confirm the rover's results.

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On All Things ConsideredPlaylist

December 3, 2012 The Hayden Planetarium director and pop-culture go-to science guy offered expert advice on how Superman could watch the destruction of Krypton.

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On Morning EditionPlaylist

December 2, 2012 There's a possibility the Mars rover has found signs of carbon-containing molecules on the red planet. That discovery is exciting because of what it might say about the Martian environment where the rover is sitting at the bottom of Gale crater.

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On All Things ConsideredPlaylist

November 29, 2012 On the poles of our solar system's innermost planet, where temperatures can drop to -100 degrees Fahrenheit, researchers have identified water ice and organic "goo," most likely deposited there by comets that crashed into the planet.

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On All Things ConsideredPlaylist

November 26, 2012 NASA astrobiologist David Morrison has taken it upon himself to answer hundreds of questions about the science of doomsday predictions. At NASA's Ask an Astrobiologist site, Morrison thoughtfully responds to questions like: Will we have Christmas this year?

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On Talk of the NationPlaylist