Keith Cooper is a freelance science journalist and editor in the United Kingdom, and has a degree in physics and astrophysics from the University of Manchester. He's the author of 'The Contact Paradox: Challenging Our Assumptions in the Search for Extraterrestrial Intelligence' (Bloomsbury Sigma, 2020) and has written articles on astronomy, space, physics and astrobiology for a multitude of magazines and websites.
called the intra-cluster medium that envelops the galaxies in the cluster. Because the gas is so hot, radiating at hundreds of millions of degrees Celsius, it shines brightly in X-rays. Abell 2146, which is a huge collision between a pair of galaxy clusters, located 2.8 billion light-years from the Milky Way. Here, the hot intra-cluster gas, imaged by Chandra, is shown in false color .
away. It's one of only three cluster collisions in the universe where the shock fronts are bright enough to be studied in detail. One of the clusters is falling through the other one. As it does so, it generates two shock waves: a"bow shock" at its leading edge and an"upstream shock" behind it. A labeled diagram of the Abell 2146 galaxy cluster collision, showing the locations of the upstream shock and the bow shock on the leading edge of the infalling cluster.
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