Apod: NGC 7635 The Bubble

The picture of NGC 7635 or The Bubble Nebula is taken long exposure with hydrogen alpha light, a type of hydrogen whose emission is visible in the red part of the spectrum and is used to find ionized hydrogen in gas clouds. The Bubble is 10 light-years in diameter and is formed from stellar wind and radiation emitted from the star located above right of the center of the bubble. This star is 10-20 times more massive than our sun. The nebula is 11,000 light-years away in the constellation Cassiopeia.