Supernova first spotted over China in 1181 is solved after 900 years

A 900-year-old cosmic mystery surrounding the origins of a supernova first spotted over China in 1181 has finally been solved. A faint, fast expanding nebula called Pa30 has been identified as the source of the 12th century explosion, which Chinese and Japanese astronomers said was as bright as the planet Saturn and remained visible for six months.…

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