The Cassiopeia A supernova remnant is a remnant of an old supernova, which exploded approximately 330 years ago in the Milky Way at a distance of 3.1 kpc from Earth. The angular diameter of the edge of the remnant is approximately 6 arcminutes. Calculate the velocity of the outer-most ejecta assuming a constant expansion since explosion. The Cassiopeia A supernova remnant is a remnant of an old supernova, which exploded approximately 330 years ago in the Milky Way at a distance of 3.1 kpc from Earth. The angular diameter of the edge of the remnant is approximately 6 arcminutes. Calculate the velocity of the outer-most ejecta assuming a constant expansion since explosion