This was a surprise to the researchers, who were originally searching for never-before-seen lensed objects that might be hiding behind the galaxy cluster. "When we discovered these individual ...

Initially, the astronomer who first made note of this fuzzy-looking glowing cluster thought it might be a nebula. But it’s ...

A mysterious cluster of 60 stars may be just another Milky Way star cluster, or it may be one of the smallest galaxies ever ...

Japanese astronomers have presented new results of observations that suggest an unidentified X-ray source designated AX ...

These clouds of radio energy are "radio relics" resulting from powerful shockwaves surging through the hot gas that fills the space amid a galaxy cluster. Credit: Kamlesh Rajpurohit et al / https ...

In this case, the lensing object is a lensing galaxy cluster called SPT-CL J0615−5746, and the background objects are the Cosmic Gems, their star clusters, and two distant lensed galaxies.

The Perseus galaxy cluster taken by the Subaru Telescope at the Mauna Kea Observatory in Hawaii. The newly discovered subcluster is on the right. Overlaid in blue is the inferred distribution of ...

Using NASA's Chandra X-ray observatory, astronomers have observed a massive and hot galaxy cluster known as PLCKG287.0+32.9 (or PLCKG287 for short). Results of the observational campaign ...

The school-bus-sized observatory launched on April 24, 1990 and overcame early setbacks to become one of the most ...

The team behind this discovery speculates that this gas could eventually become the hot, diffuse gas called the intracluster medium (ICM) that has been seen filling mature galaxy clusters.