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The remnants or relic of a supernova explosion. It can be a neutron star, a pulsar or a black hole surrounded by an expanding cloud of gas.

The Crab Nebula (M1) is a famous supernova remnant in Taurus that's visible with binoculars.

The Crab Nebula is the remnant of a supernova that exploded in 1054  (credit:- NASA, ESA, and The Hubble Heritage Team (STScI/AURA))

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