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Thirty-four years after NASA's Viking missions to Mars sent back results interpreted to mean there was no organic material - and consequently no life - on the planet, new research has concluded that organic material was found after all.

NASA may appear to have its pick of thousands of known asteroids for a manned mission, but only two are good targets within the next 20 years. An asteroid mission requires a large-enough destination that astronauts could reach within a few months of launch from Earth, says Lindley Johnson, head of NASA's Near-Earth Object program in Washington. Other limits to such an ambitious undertaking include the viewing range of ground-based telescopes.

The moon is shrinking ever so slightly, but there is no cause for alarm, according to a new study that has discovered a clutch of previously unseen faults on the lunar surface from photos taken by a NASA probe.

NASA engineers are working around-the-clock to firm up plans to send astronauts on two emergency spacewalks outside the International Space Station to repair a serious cooling system failure.

NASA briefly broke with the standard space jibber jabber, jammed on the cap locks, and began alerting its followers with repeated messages about "BRAND NEW PLASMA FLAT SCREEN TV!!! WHOLESALE LIST!"

"We'll start by sending astronauts to an asteroid for the first time in history," President Obama said in an April speech at NASA's Kennedy Space ...

Scientists don't know quite why, but one of Jupiter's two main cloud belts has disappeared -- again.

If NASA's exploration of Mars were summed up in a bumper sticker, it would read: "Follow the water."...

NASA is considering a plan to get around limited budgets set in Washington by stretching out missions to bring back samples from Mars, a researcher said on Wednesday.

President Barack Obama predicted Thursday his new space exploration plans would lead American astronauts to Mars and back in his lifetime, a bold forecast relying on rockets and propulsion still to be imagined and built.