The closest look ever at a new comet will happen when the mountain-size comet Siding Spring buzzes past Mars this weekend.
The Air Force says that the almost one-of-a-kind spacecraft "conducted on-orbit experiments" in the the longest-ever mission for the X-37B program.
Humans could begin moving to Mars as soon as 2024 as part of an ambitious Dutch reality-TV/space-exploration project, but a few MIT students say it might not be so simple.
Declaring that "failure is not an option," Alyssa Carson wants to go further than any human has gone before. She's already been to NASA's Space Academy three times.
NASA is preparing the new Orion spacecraft for a first test flight. Your name can fly along with it -- eventually to the Red Planet.
NASA's looking for innovative ways to get a manned crew safely to the Red Planet. Could deep sleep hold the key to success?
The SpaceX founder hopes to put humans on Mars in the mid-2020s, but that's just the first tiny baby step toward creating his vision of a Martian metropolis.
Get a head start on building your very own 1970s-style Mars orbiter by snapping up an engine built for NASA's Viking project.
After two years of exploration and driving, NASA's Curiosity rover has finally reached the base of Mount Sharp, a major goal of the mission.
NASA aims to correct a series of problems with the Opportunity rover's memory by giving it a reformat from far, far away.