This 850-year-old 'firework' supernova is full of mysterious knots
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Quick factsWhat it is: Pa 30, a supernova remnantWhere it is: 7,500 light-years away, in the constellation CassiopeiaWhen it was shared: Oct. 6, 2026A mysterious "guest star" recorded by medieval astronomers nearly 850 years ago has revealed new secrets after scientists obtained the clearest images yet of its explosive aftermath. New observations of Pa 30, thought to be the leftovers of a historic supernova called SN 1181, show that its spectacular firework-like filaments are not smooth streams
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