The night sky is, and always has been, safe and free.
Neutron stars are like the most efficient thermoses in the universe, filled with hot noodle soup. Here's how, over the course of millions of years, they cool down.
Some galaxies are swirling blue disks, others are red spheres or misshapen, clumpy messes or something in between. Why the different configurations?
Back in 2016, researchers claimed Dragonfly 44 was a "failed" Milky Way — a galaxy with a huge dark matter mass but almost no stars. Now, on closer examination, that claim has fallen apart.
Powerful stellar eruptions could pose a serious challenge to the origin and evolution of life around the universe, a new study suggests.
Something pulled the outer layer of Cassiopeia A off before it detonated to form this gorgeous supernova. But what?
Scientists have conducted a new cosmos-wide matter census, finding that the stuff makes up 31% of our universe.
Tens of millions of years ago, the corpse of a star stole away too much gas from a neighbor and exploded, becoming a beacon in the cosmos — one that took a full year to fade away.
Mars is lighting up the night sky as the planet heads toward an unusually close approach to Earth on Oct. 6.
NASA recently highlighted some collaborations between the Chandra X-ray Observatory and other telescopes.
Autumn officially arrives in the Northern Hemisphere on Tuesday, Sept. 22 at 9:31 a.m. EDT (1331 GMT). And consequently, our evening sky is now one in transition.
Each star system is a unique paintbrush in the cosmos, and astronomers are finally beginning to understand why.
An international contest for space photography awarded its top prize to the photographer who captured a unique view of the Andromeda galaxy.
The imaging sensors for the future Vera C. Rubin Observatory have taken their record-breaking first photos.
Astronomer Jackie Faherty has teamed up with some of the world's leading scientists to create a new Astronomy course that people can take from the safety of their own homes.
At this time of year, some might be attracted by the presence of an unusually bright star sparkling over the north-northeast horizon.
Every once in a while, something will appear in the sky that will attract the attention of even those who normally don't bother looking up.
Groups of stars can tear their planet-forming disk to shreds, leaving behind warped, misaligned rings, scientists find in a breakthrough study.