Kathleen Tierney faced felony charges for posting a GIF on a Tempe councilman's Facebook that the city viewed as a threat.

When the most massive stars reach the ends of their lives, they blow up in spectacular supernova explosions, which seed the ...

Mysterious Bright Flashes in the Night Sky Baffle Astronomers Celestial transients shine furiously and briefly. Astronomers ...

Cosmic “touchdown airbursts” — explosions of comets or asteroids above Earth’s surface — may be far more common and destructive than previously thought, according to new research. Unlike ...

These out-of-place artifacts, or OOPArts, are surprising for their place and time — but there's an explanation behind each ...