The Bubble Nebula, also known as NGC 7635

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• The Bubble Nebula, also known as NGC 7635, is an emission nebula located 8,000 light years
•  away in the Cassiopeia constellation. The bubble is created by stellar wind pushing out from 
• a massive hot central star, visible here just left of the center of the image, a purple star
•  partly obscured by blue gas clouds. The nebula is seven light years across—about one-and-a-half
•  times the distance from our sun to its nearest stellar neighbor, Alpha Centauri. This stunning 
• image was observed by the NASA/ESA Hubble Space Telescope to celebrate its 26th year in space