SN 1572

Supernova in the constellation Cassiopeia

SN 1572 (also Tycho's Star, Tycho's Nova, or Tycho's Supernova), or B Cassiopeiae (B Cas), was a supernova of Type Ia in the constellation Cassiopeia, one of eight supernovae visible to the naked eye according to historical records. It appeared in early November 1572 and was independently discovered by many individuals. Its supernova remnant has been observed optically but was first detected at radio wavelengths.

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