A large international team of over 80 astronomers using NASA’s Chandra X-ray Observatory, the South Pole Telescope, and eight other world-class observatories, has discovered an extraordinary galaxy cluster – one of the largest objects in the Universe – that is breaking several cosmic records. A composite image of the Phoenix Cluster (X-ray: NASA / CXC / MIT / M. McDonald, UV: NASA / JPL-Caltech / M. McDonald, optical: AURA / NOAO...