Chandra

Some of the most monstrous black holes in the universe are growing faster than their host galaxies, new research suggests.

Jupiter's northern and southern lights continue to dazzle — and puzzle — the scientists who study them, as highlighted in a new video from NASA.

Astronomers have pinpointed five pairs of merging black holes using three different space and ground-based instruments and two sky surveys.

Scientists detected gravitational waves from merging neutron stars. What have they become now?

A new video shows the explosive reaction when a dense stellar corpse sucks up material from a pulsating dead star.

A wave of hot gas twice as wide as the Milky Way galaxy roils the nearby Perseus galaxy cluster, a new study indicates.

A supermassive black hole has been gobbling up a star for more than a decade — about 10 times longer than any previously known such meal, a new study finds.