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Sep 17, 2021, 4:25 pm172 pts
Ars Technica
Enlarge / Hubble Space Telescope mosaic image of the Crab Nebula, a six-light-year-wide expanding remnant of a star's supernova explosion in 1054 CE (credit: NASA/ESA/J. Hester & A. Loll (Arizona State University) In August 1181, astronomers in China and Japan witnessed a bright "guest star" in the night sky…
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