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NGC 7635, also known as the Bubble Nebula, is an H II region emission nebula in the constellation Cassiopeia. In the sky, it lies close to the open star cluster Messier 52. Within the diffuse emission nebula there is a dark inclusion which appears as a faint and diffuse oval, about 3.5 x 3 arcminutes in size. This "bubble" is created by the stellar wind from the massive, hot and young 8.7 magnitude central star SAO 20575. The Bubble Nebula is difficult to see visually because of its low surface brightness. Its distance has been estimated to about 7,100 light-years.
M52 and NGC 7635 - Bubble Nebula Region, HαRGB image.
NGC 7635- Bubble Nebula in Hα, which is part of this image.
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