Bubble Nebula, also known as NGC 7635, Sharpless 162, Caldwell 11, and Sh2-162, is a HII Region Emission Nebula located inside The Cassiopeia Constellation. Bubble Nebula is located around 7100 Light Years to 11,000 Light Years from Earth. Bubble Nebula has a radius of 3 to 5 Light Years. The most recognizable feature of Bubble Nebula is The Bubble formation itself incircle it's inside feature which is created by Stellar Wind from a young Central Star known as SAO 20575. Bubble Nebula was discovered by German-British Astronomer William Herschel in 1787.
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