Messier 57 also known as the Ring Nebula is a planetary nebula in the constellation Lyra.
This type of nebula is formed when a shell of ionized gas in expelled by a red giant star when it is passing through the final stage in becoming a white dwarf.
The nebula was discovered by French astronomer Charles Messier in January 1779.
The nebula lies at a distance of 2300 light-years and is an easy target in a moderately sized telescope.
|Name||M57 – The Ring Nebula|
|Right ascension||18h 53m 35s|
|Declination||+33° 01′ 45″|
|Other designations||NGC 6720|