What appears to be the fourth independent record of the Crab nebula supernova in 1054 was discovered in a cave in northern California, according to Stephen Maran of NASA's Goddard Space Flight Center. The American Indian petroglyph consists of a drawing of a sphere and a crescent; the sphere is thought to represent the supernova and the crescent, the moon. The findings were reported at the Michigan State Meeting of the American Astronomical Society in August.
Steven M. Hein; Cave drawing is evidence of Crab nebula supernova. Physics Today 1 October 1972; 25 (10): 20. https://doi.org/10.1063/1.3071042
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