See views of The Horsehead Nebula, the Perseus Cluster of galaxies, spiral galaxy IC 342, irregular galaxy NGC 6822 and globular cluster NGC 6397. IMAGE CREDIT: ESA/Euclid/Euclid Consortium/NASA ...

Famed for its unbelievable size — containing the mass of some 600 trillion suns — it also has a reputation for being one of the few "relaxed" galaxy clusters out there: it shows no signs of ...

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 ...

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 1958 the great extragalactic astronomer George Abell of UCLA compiled a catalog of galaxy clusters. It was extended by Abell and collaborators in 1987 and eventually contained 4,076 clusters.

They each orbit around their common center of mass. Because the density of galaxies is high within clusters, galaxy collisions occur. One such collision can be seen in the lower right of the image ...

"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 ...