Image Credit & Copyright: Yves Van den Broek
Explanation: Blown by the wind from a massive star, this interstellar apparition has a surprisingly
familiar shape. Cataloged as NGC 7635, it is also known simply as
The Bubble Nebula. Although it looks delicate, the 10 light-year diameter bubble offers evidence of
violent processes at work. Above and right of the Bubble's center is a hot,
O star, several hundred thousand times more luminous and around 45 times more massive than the Sun. A fierce stellar wind and intense radiation from that star has blasted out the
structure of glowing gas against denser material
in a surrounding molecular cloud. The intriguing Bubble Nebula lies a mere 11,000 light-years away toward the boastful constellation
Cassiopeia. This view of the cosmic bubble is composed of narrowband and broadband image data, capturing details in the emission region while recording a natural looking field of stars.
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