On the week of the 15th anniversary of NASA's Opportunity rover's touchdown, officials are acknowledging that it could be permanently out of commission.

“This could be the end,” principal investigator Steven Squyres told the New York Times on Friday. “Under the assumption that this is th…

Hot spots have been discovered orbiting just outside the supermassive black hole at the galaxy’s center. Their motions have given us the closest look at that violent environment.

“It’s a remarkable moment, in terms of these experiments’ ability to start probing how gravity works near a s…

The spacecraft’s final observations are turning up a wealth of bizarre, unexpected phenomena.

But what they seem to have found was far more material than they had expected, coming from far more exotic compounds. The instrument spotted not just hydrogen and helium but also carbon monoxide…

A planet-spanning virtual observatory, years in the making, could change how we think about space, time and the nature of reality. Will it work?

Avery Broderick, a theoretical astrophysicist who works with the Event Horizon Telescope, said in 2014 that the first picture of a black hole c…

With every second that goes by, tens of thousands of star disappear from our reach. And it's getting worse.