The Rosette Nebula or Caldwell 49 (Picture of the Day)

The Rosette Nebula
The Rosette Nebula (or Caldwell 49) is an emission nebula which is about 5,000 light years away from Earth in the constellation of Monoceros. The nebulas spans about 130 light years in diameter and the central cavity of the nebula is about 50 light years in diameter. The symmetric shape of the petals are sculpted by the winds and radiation from the hot young stars in the central region.

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