Cassiopeia A, a supernova remnant located 10,000 light-years away in the constellation Cassiopeia

Cassiopeia A, a supernova remnant located 10,000 light-years away in the constellation Cassiopeia

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Cassiopeia A, a supernova remnant located 10,000 light-years away in the constellation Cassiopeia

Cassiopeia A, a supernova remnant located 10,000 light-years away in the constellation Cassiopeia

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