Using NASA's Chandra X-ray space telescope, astronomers have discovered that a galaxy cluster is wrapped in an envelope of ...

Astronomers have discovered a huge filament of hot gas bridging four galaxy clusters. At 10 times as massive as our galaxy, the thread could contain some of the universe's 'missing' matter, addressing ...

For anyone disappointed that the Milky Way – our host galaxy – may not collide with our closest neighbor Andromeda after all, ...

A vast, glowing halo enveloping a galaxy cluster has been discovered, defying expectations and pointing to turbulent cosmic ...

The galaxy clusters involved in this scuffle are part of a larger system—a “combined” galaxy cluster—called PSZ2 G181. In a ...

In a dense galaxy cluster, NGC 4858 shows how cosmic winds strip gas, spark new stars, and shape stunning jellyfish-like ...

Astronomers have discovered the largest known cloud of energetic particles surrounding a galaxy cluster—spanning nearly 20 ...

Despite their enormous distance, the galaxy clusters are gravitationally bound and slowly turning back for another high-speed ...

A cloud of energetic gas lit up by a collision of galaxies spans nearly 20 million light-years, leading astronomers to ...

At the heart of our galaxy lies a cosmic puzzle: although the Galactic Center is packed with star-making material, massive ...

The galaxy cluster PSZ2 G181 was recently observed by the Chandra X-Ray Observatory, revealing two separate clusters that had ...

Astronomers have spotted two clusters of galaxies that have collided, and appear to be lining up to smack into each other a second time. Galaxy clusters are giant collections of sometimes hundreds ...