A PHOTO: Chandra Reveals the Elementary Nature of Cassiopeia A Author AlexPublished on December 12, 2017 Due to its unique evolutionary status, Cassiopeia A (Cas A) is one of the most intensely studied of these supernova remnants. via NASA http://ift.tt/2C6ofVz Share this:MastodonEmailLike this:Like Loading... Related posts: A PHOTO: Close-up View of Neutron Star Mission’s X-Ray Concentrator Optics A PHOTO: Hubble Showcases a Remarkable Galactic Hybrid A PHOTO: Phantom Limb A PHOTO: Basking in Light