Ring Nebula or M57 (Picture of the Day)

Ring Nebula or M57
The Ring Nebula (M57 or NGC 6720) is a planetary nebula which is about 2,000 light years away from Earth in the constellation of Lyra. This is one of the brightest planetary nebula on the sky. The nebula spans about 1 light year in diameter. The shell of the nebula is made of ionized gases expelled by a red giant star, which is in the last stage of evolution before becoming a white dwarf.

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