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 ...

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.

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

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 ...

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 ...

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

The XRISM science team, including members of Nagoya University, has explained how galaxy clusters maintain their heat despite emitting X-rays, which typically have a cooling effect on the hot gas.

"All the odd shapes and swirling gas observed in the Perseus cluster now make sense within the context of a major merger." Astronomers have discovered a long-missing element of a galactic ...

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 ...

This image shows quasar Markarian 231, the closest one to Earth, glowing with starlike brilliance. This image hints at two supermassive black holes spinning together at its centre. Green peas are an ...

The school-bus-sized observatory launched on April 24, 1990 and overcame early setbacks to become one of the most scientifically productive instruments in history. From its vantage point 320 miles ...