The Crescent Nebula
NGC 6888 The Crescent Nebula is an Emission nebula about 25 light years wide and around 5,000 light years away in the Constellation Cygnus.
At the heart of the nebula is a Wolf-Rayet star WR136 it is 5.1 times larger than the Sun,nearly 10 times hotter,21 times as massive and over 60,000 times brighter.
It was WR136 that caused the formation of NGC 6888.
It is thought that WR136 will end it's life in a dramatic stellar explosion known as a Supernova.