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In this wide-angle view, the Bubble nebula lies at the center of a larger complex of shocked glowing gas about 11,000 light-years distant in the fair constellation Cassiopeia. NGC7635 really is an interstellar bubble, blown by winds from the brightest star visible within the bubble's boundary. The bubble's expansion is constrained by the surrounding material. About 10 light-years in diameter, if the Bubble nebula were centered on the Sun, the Sun's nearest stellar neighbor, Alpha Centauri, would also be enclosed.
Image taken with a Canon EOS 20Da camera in prime focus of a professional reflector-telescope at 1290mm f/5.1. Exposure time is 75 minutes !
This is a very deep and real image, so the "noise" in background is no noise, these are very very dim stars again. The image is not overprocessed and sharp. See the spikes on the very bright stars.