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NGC 7635, the Bubble nebula. A massive star that is not only bright and blue, but also emitting a fast stellar wind of ionized gas, created this huge space bubble. The Bubble nebula is actually the smallest of three bubbles surrounding massive star BD+602522, and part of gigantic bubble network S162 created with the help of other massive stars. As fast moving gas expands off BD+602522, it pushes surrounding sparse gas into a shell. The energetic starlight then ionizes the shell, causing it to glow. The Bubble Nebula is about 10 light-years across and visible with a small telescope towards the constellation of Cassiopeia. PDF version: https://www.ing.iac.es/PR/dissemination/bubble.pdf
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