Messier 57 (M57) is a planetary nebula in the Lyra constellation. M57 is better known as the Ring Nebula. Its alternative designation is NGC 6720.
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— by Joseph D. Schulman —
Messier 57 (M57) is a planetary nebula in the Lyra constellation. M57 is better known as the Ring Nebula. Its alternative designation is NGC 6720.
Click for larger view and more details (including purchasing options).
