The public can bid on a spot next to the Avatar director on an upcoming ZERO-G flight.

Researchers are hoping that the Mars500 simulation, which hits the three-month mark this week, will shed some light on significant factors to consider in crew selection for future long-duration missions.

New research pins down the epoch when galaxy clusters make the last of their stars, helping astronomers understand more about how galaxies form.

A new glimpse of a well-known supernova could provide new clues about how dying stars affect their surroundings.

See the aftermath of a supernova explosion in this animation of Hubble Space Telescope photos.