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The Crab Nebula is the most famous known supernova remnant, the expanding cloud of gas created in the explosion of a star as supernova which was observed in the year 1054.The image is taken in the in prime focus of professional mirror telescope (newtonian) the Exposure time is 150 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.The image processing is made according to scientific rules for long exposed astronomical pictures.