A massive, spacetime-warping cluster of galaxies is the setting of today's NASA/ESA Hubble Space Telescope image. The galaxy ...

Using NASA's Chandra X-ray space telescope, astronomers have discovered that a galaxy cluster is wrapped in an envelope of energized particles that's 20 million light-years wide. The discovery raises ...

The discovery, made with the LOFAR (LOw Frequency ARray) radio instrument in Europe, indicates that galaxy clusters, which ...

This unprecedented view of the Bullet Cluster provided by the James Webb Space Telescope and the Chandra X-ray Observatory ...

New simulations suggest that dozens of ultra-faint “ghost” galaxies may be orbiting the Milky Way, hidden from current ...

NASA Chandra X-ray telescope data from galaxy cluster Abell 2146 showed a "shockwave that stretches for some 1.6 million ...

The NASA/ESA Hubble Space Telescope has unveiled a stunning image of the Abell 209 galaxy cluster, located 2.8 billion ...

A new galaxy was found with 10,000 more of unseen mass than the Milky Way. Now, scientists are wondering if there are more of ...

Using the Very Large Array (VLA), astronomers have performed radio observations of a galaxy cluster Abell 2744, nicknamed ...

In a groundbreaking study of 1.58 million galaxy clusters, an international team of astronomers led by Dr. Michael West of ...

An astronomer led an international study mapping galaxy clusters, and it was published Monday in The Astrophysical Journal ...

Some of these open clusters are pretty famous, such as the Pleiades cluster, also known as the Seven Sisters. This is ...