Massive, bustling Perseus galaxy cluster dazzles in new telescope image Deep in the heart of the massive Perseus cluster, giant galaxies stir, stars are torn from their homes and hot gas radiates at more than 1 million degrees Celsius. https://cdn.mos.cms.futurecdn.net/W9manUWhz82KJajkCXT6oS.jpg https://www.space.com/perseus-galaxy-cluster-gemini-north-telescope-photo