... About eleven thousand years ago a star in the constellation of Vela exploded, creating a strange point of light briefly visible to humans living near the beginning of recorded history . The outer layers of the star crashed into the interstellar medium , driving a shock wave that is still visible today . ... Publications with keywords: shock - Vela - supernova remnant - supernova . Publications with words: shock - Vela - supernova remnant - supernova . ... Keplers Supernova Remnant in X Rays . ...