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M52 and Bubble Nebula

Taken by: Bob Finnigan and Lee Green
Date: 12/5/2010
Exposure: 10-10-10-10 HaRGB

Here's the Bubble Nebula next to the M52 open cluster in Cassiopeia. While M52 is a mature open cluster, the Bubble Nebula may be the first star of a new cluster. The bubble is formed by a star that is blowing away the material from which it was formed.