New evidence from an old NASA mission supports the theory that Jupiter's moon Callisto is in fact an ocean world. A moon of Jupiter about the size of Mercury likely has a several-miles-deep ocean ...

The iconic puffy white suits that astronauts have donned for decades as they step outside the International Space Station are rapidly aging — but NASA is now without concrete plans to replace them.

After almost 40 years circling Earth, a retired NASA science satellite plunged harmlessly through the atmosphere off the coast of Alaska, NASA reported Monday. The Defense Department confirmed that ...

An old NASA satellite is expected to fall to Earth this week, but experts tracking the spacecraft say chances are low it will pose any danger. The defunct science satellite known as Rhessi will ...

An old NASA satellite is expected to fall to Earth this week, but experts tracking the spacecraft say chances are low it will pose any danger.The defunct science satellite known as Rhessi will plummet ...