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.
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M 57
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.