The NGC 4839 group of galaxies is plunging into the Coma galaxy cluster and leaving behind an extraordinary tail of superheated gas.

Four composite images deliver dazzling views from NASA's Chandra X-ray Observatory and James Webb Space Telescope of two galaxies, a nebula, and a star cluster.

With a single letter seemingly etched in the X-ray glow around it, a giant black hole at the center of a massive elliptical galaxy is making a mark on its surroundings.

Astronomers have identified a new threat to life on planets like Earth: a phase during which intense X-rays from exploded stars can affect planets over 100 light-years away.

Data from Chandra show the effects of powerful winds launched from the center of a nearby galaxy.

A distant – and lonely – galaxy appears to have pulled in and assimilated all of its former companion galaxies.

A new study using NASA's Chandra X-ray Observatory has tracked two pairs of supermassive black holes in dwarf galaxies on collision courses.

Astronomers have captured a spectacular, ongoing collision between at least three galaxy clusters. Data from Chandra, XMM-Newton, and a trio of radio telescopes are helping astronomers sort out what is happening in this jumbled scene.

A new survey using NASA's Chandra X-ray Observatory has uncovered hundreds of previously "hidden" black holes.

A new study provides insight into how X-rays from stars like our Sun, but billions of years younger, could partially or completely evaporate the atmospheres of planets orbiting them.