Image: Hot gas sloshing in a galactic cauldron
Tuesday, November 19, 2013 - 08:00
in Astronomy & Space
(Phys.org) —Galaxies are social beasts that are mostly found in groups or clusters – large assemblies of galaxies that are permeated by even larger amounts of diffuse gas. With temperatures of 10 million degrees or more, the gas in galaxy groups and clusters is hot enough to shine brightly in X-rays and be detected by ESA's XMM-Newton X-ray observatory.