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 ...

A novel "X-arithmetic" technique reveals how black holes shape the universe's largest structures. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.

A developing galaxy cluster dating to about 1 billion years after the Big Bang is shown in this handout image released on January 28, 2026. The white box marks the field of view of the Chandra X-ray ...

Astronomers have explained how a galaxy cluster maintains its heat, despite emitting X-rays that cool the hot gas at its center. The group discovered the existence of a fast-moving, high-temperature ...

This infant cluster is massive for its relative youth, with a core measuring about 500,000 light years across, comparable to the size of the halo surrounding the Milky Way. It contains more than 30 ...

"It's astonishing to find such a strong radio signal at this distance." When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. A vast cloud of energetic ...

The galaxy cluster Abell 2029 is sometimes described as "the most relaxed cluster in the universe." This moniker does not arise from some sort of mellow vibe, but rather because of how calm and ...

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 ...