NGC 7635 - The Bubble Nebula processed by Brian Puhl from image data acquired on Insight Observatory's CDK500 remote telescope located in Spain (AFIL-7). NGC 7635, commonly known as the Bubble Nebula, is one of the most fascinating and visually striking objects in our night sky. Situated in the constellation Cassiopeia, this celestial wonder is a massive emission nebula, and its nickname is derived from its distinctive bubble-like appearance. The Bubble Nebula is particularly renowned for its unique characteristics, which have captivated the curiosity of astronomers and stargazers alike. One of the most distinctive features of the Bubble Nebula is the enormous, nearly spherical shell of gas and dust that envelops a central, massive star named BD+60°2522. This star's intense ultraviolet radiation ionizes the surrounding hydrogen gas, causing it to emit a brilliant red glow, typical of emission nebulae. The expanding shell of the Bubble Nebula, created by the powerful solar ...