Galaxy clusters are the most massive objects in the universe held together by gravity, containing up to several thousand individual galaxies and huge reservoirs of superheated, X-ray-emitting gas. The ...

Using the James Webb Space Telescope, astronomers have spotted a massive and densely packed galaxy cluster before such structures were thought to be possible.

A novel "X-arithmetic" technique reveals how black holes shape the universe's largest structures.

A stunningly concentrated and hefty galaxy cluster, from a time in the universe's history when such massive structures aren't ...

Astronomers studying a distant galaxy cluster stumbled upon ancient radio signals that might hold clues to the formation of the early universe. While studying the distant galaxy cluster known as ...

The Birthplace of Stars: More Crowded Than You Think In galaxies like our own Milky Way, stars rarely lead lonely lives from ...

A galaxy cluster over 6 billion light years away. Peering back in time to when the universe was younger than the Earth is now, the images span the period from around twelve billion years ago until one ...

It is located 27,000 light-years away in the constellation Sagittarius, and it shines like a chandelier filled with countless ...

Scientists have detected a surprisingly hot galaxy cluster dating back to the universe’s infancy. The cluster formed far earlier and burned far hotter than current models predict. Researchers believe ...

Galaxy clusters are the largest gravitationally bound systems in the Universe and serve as critical laboratories for cosmology, astrophysics and the study of dark matter. Their mass profiles—traced by ...

Galaxy clusters represent the most massive gravitationally bound systems in the Universe, comprising hundreds to thousands of galaxies embedded in a vast halo of dark matter and suffused by a hot, ...

Most astronomers agree that young galaxy clusters should be relatively cool compared to older ones. But researchers recently found a very young... A galaxy cluster hotter than the surface of the sun ...