1054 Daylight Supernova Guest Star

When a massive star goes supernova, it can briefly shine with the power of an entire galaxy’s stars put together. In 1054, observers in China recorded a “guest star” so bright it was visible in daylight for 23 days, then continued to glow at night until about 1056. Today, astronomers link that blast to the Crab Nebula in Taurus.

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