This is M 27 or NGC 6853, also known as the Dumbell nebula.
It is a planetary nebula in the constellation Vulpecula, a rest of a supernova explosion.
Tag: planetary nebula
M 57 or NGC 6720 is a planetary nebula in the constellation of Lyra and it is what remains of a supernova explosion.
At its center there is a white dwarf which is what remains of the supernova core.
