A Star Cluster and the Bubble Nebula
Messier Catalog: M 52, New General Catalogue of Nebulae and Clusters of Stars: NGC 7635
Constellation: Cassiopeia

Another two astronomical objects nicely aranged to form a pair in my 6" telescope frame. The open star cluster M52 was catalogued by the comet hunter Charles Messier and published in 1783. It is an association of stars that formed together from interstellar gas and dust, which was blown away by strong stellar winds.

The cloud to the lower left may be the earlier stage of a star evolution like this. It is called the "Bubble Nebula" because an extremely hot star in the center formed a nearly perfectly round shell around it. The nebula was discovered in 1787 by William Herschel.

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