According to the catalog, this site is known as NGC 7635, but most simply use the common name of "The Bubble Nebula". 11 000 light-years away from the Earth and a good 10 light-years in diameter, it contains a cloud of expanding gas, thus resembling a bubble, as the central star of the system--the O star--emits radiation, heating the cloud against a denser material in a surrounding molecular cloud, and creating a glow, giving it a sheen. It inhabits the sky adjacent to Cassiopeia (the Seated Queen) and may perhaps be a part of a larger complex of celestial objects.
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