After spending a month in space, a small group of mice returned to Earth with joint problems. Now scientists are wondering what that means for humans who go to space.

NASA is inviting people around the world to submit their names for inclusion on microchips that will fly aboard the life-hunting Mars 2020 rover, which is scheduled to launch next summer.

Earlier this month, engineers put the Mars 2020 rover's fully assembled spacecraft through some tests at the Space Simulator Facility at NASA's Jet Propulsion Laboratory in Pasadena, California.

What's in a name? Well, for the amateur astronomers and scientists fixated on Jupiter, there's been a recent need to describe its iconic storm as more than just a great red spot.

The moon will make a close pass to Saturn this evening (May 22), so close that our natural satellite will block the view of the ringed planet for skywatchers in parts of the world.

Cinema's favorite silver-suited, metal-booted cybernetic killing machine is back.

Space.com's editors present a list of the astrophysics and astronomy books worth a read-through.