Messier 52 and NGC 7635 The Bubble Nebula
This image shows the open star cluster M52 and NGC 7645, the Bubble Nebula, situated in the constellation Cassiopeia. M52 lies 5,200 light years away.
Lying 11,300 light years away the Bubble Nebula is being forced out by a stellar wind of ionised gas fram a massive central star.