New observations of the young cluster SPT2349-56 with the Atacama Large Millimeter/submillimeter Array (ALMA) have revealed unexpectedly scorching intracluster gas just 1.4 billion years after the Big Bang, challenging current models of galaxy cluster evolution. An artist’s impression of the forming galaxy cluster SPT2349-56: radio jets from active galaxies embedded in a hot intracluster atmosphere (red), illustrating a large thermal reservoir of...
