'Diamond Ring' Nebula (Picture of the Day)

Diamond Ring nebula or Abell 33
The 'Diamond Ring' nebula (or the Abell 33) is a planetary nebula which is about 2,500 light years from Earth in the constellation of Hydra. The blue bubble is created when an old star blew off its outer layers and formed into a nebula. The 'diamond ring' appearance is caused by the bright blue star (HD 83535) in the background which is actually not part of the nebula. This nebula is unusually symmetric for a planetary nebula since there are many objects which can disturb the symmetrical shape. It appears to be almost circular in the sky.

Image Credit: ESO
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