Exceptionally rare radio sources detected in the distant universe

Astronomers have spotted a pair of exotic features believed to be the aftermath of a colossal cosmic smackdown — not between two galaxies, but two groups of galaxies. These glowing arcs of radio energy are known as "radio relics," faint clouds resulting from powerful shockwaves surging through hot gas that fills the space amid a galaxy cluster.The cluster, PSZ2 G181.06+48.47, is some 963 million light-years from Earth, but its image is less forgettable than its name. Using the Gi