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.
The spacesuits of the future might be totally alien-looking.
The strange appearance of Uranus' moon Miranda may finally have an explanation.