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NEBULAE & STAR CLUSTERS
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Bubble Nebula (NGC 7635)


Bubble Nebula
The Bubble Nebula. Image courtesy Richard Crisp
The smallest of three bubbles surrounding the massive star BD +60° 2522 in the constellation Cassiopeia (R.A. 23h 20.7m Dec. +61° 12'), and part of the gigantic bubble network S162, created with the help of other massive stars. As fast-moving gas spreads out from BD +60° 2522, it pushes surrounding sparse gas into a shell. The energetic starlight then ionizes the shell, causing it to glow. The nebula is about 6 light-years across and visible even with a small telescope.


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