Chandra Reveals the Elementary Nature of Cassiopeia A Posted on December 12, 2017 by Frank Cisco 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: Share on X (Opens in new window) X Share on Facebook (Opens in new window) Facebook Like Loading... Related