- In 1054, Chinese astronomers took notice of a “guest star” that was, for nearly a month, visible in the daytime sky. The “guest star” they observed was actually a supernova explosion, which gave rise to the Crab Nebula, a six-light-year-wide remnant of the violent event. https://earthsky.org/clusters-nebulae-galaxies/crab-nebula-was-an-exploding-star 794 comments space
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