Ultraviolet image of the Cygnus Loop Nebula crop Card
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Wispy tendrils of hot dust and gas brightly in this ultraviolet image of the Cygnus Loop Nebula, taken by NASA’s Galaxy Evolution Explorer. The nebula lies about 1,500 light-years away, and is a supernova remnant, left over from a recoverstellar explosion that occurred 5,000-8,000 years ago. The Cygnus Loop extends more than three times the size of the full moon in the night sky, and is tucked next to one of the 'swan's' in the constellation Cygnus. The filaments of gas and dust visible here in ultraviolet light were heated by the shockwave from the supernova, which is still outward from the original explosive. The original supernova would have been bright enough to be seen from Earth without a telescope.