If only dinosaurs had invented telescopes, they might have seen lava occasionally oozing from the surface of the moon.
Monday marks Columbus Day for people in the United States, but did you know there was a lunar twist to the famous explorer's journey?
The U.S. Air Force's mysterious X-37B space plane will return to Earth this week —possibly as early as Tuesday — after 22 months in orbit on a secret mission.
Water trapped in rocks on the moon's surface probably originated mostly from streams of energetic particles blasted from the sun and not from cosmic impacts from comets,...
A black hole is eating a star faster than scientists had thought was possible, and it's unleashing unusually bright X-ray signals that may help scientists understand a group of...
Existing medical techniques are laying the foundations for an ambitious research project to send astronauts into a deep sleep on a six-month journey to Mars, according to the...
Two astronauts ventured outside the International Space Station to do some maintenance and repair work during a more-than-6-hour spacewalk today Oct. 7.
A NASA-backed study explores an innovative way to dramatically cut the cost of a human expedition to Mars -- put the crew in stasis.