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How old is the Cygnus Loop?
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Supernova remnant
Detail of the Cygnus Loop.
This nebula is the product of a supernova explosion; in this section, the blast wave has encountered an area of dense interstellar gas, creating turbulence in the wave and causing it to glow. The picture is a composite of three images taken by the Hubble Space Telescope.
The Cygnus Loop is estimated to be approximately 10,000 years old.12