Chandra Reveals the Elementary Nature of Cassiopeia A via NASA https://t.co/HDAdxb5OS3 https://t.co/VaTzXtfQby

Chandra Reveals the Elementary Nature of Cassiopeia A via NASA https://t.co/HDAdxb5OS3 https://t.co/VaTzXtfQby (http://twitter.com/muhamadiqbaldar/status/940654461885865987)