A supernova lit up Earth’s sky in 1054 and was visible in daylight. Hubble now shows its glowing remains are still expanding nearly 1,000 years later

Astronomers used the Hubble Space Telescope to measure the expanding Crab Nebula. New images compared with older ones show ...
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July 4, 1054: The Crab Nebula supernova explodes

On July 4, 1054, a supernova explosion occurred, marking the death of a star thought to be nine to 11 times more massive than ...