Photo credit: International Gemini Observatory/NOIRLab/NSF/AURA/M. RodriguezEight separate records from Chinese, Japanese, and Arabic observers place a new star in Cassiopeia between August 4-6, 1181. It stayed visible for 185 days, long enough for court astronomers to log it during the Genpei War in Japan and the reign of Henry II in England. One of only […]
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