Chandra Spots a Mega-Cluster of Galaxies in the Making
Astronomers using data from NASA’s Chandra X-ray Observatory and other telescopes have put together a detailed map of a rare collision between four galaxy clusters. Eventually all four clusters — each with a mass…
Hubble Finds Medusa in the Sky
The galaxy pictured in this Hubble image has an especially evocative name: the Medusa merger. Often referred to by its somewhat drier New General Catalogue designation of NGC 4194, this was not always one…