The biggest event which never happened and no one knows about? Offering a novel reinterpretation of some forgotten historical data, several Mexican researchers say a billion-ton comet may have passed a few hundred miles from Earth in 1883. Via Technology Review:
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On 12th and 13th August 1883, an astronomer at a small observatory in Zacatecas in Mexico made an extraordinary observation. José Bonilla counted some 450 objects, each surrounded by a kind of mist, passing across the face of the Sun.
Bonilla published his account of this event in a French journal called L’Astronomie in 1886. Today, Hector Manterola at the National Autonomous University of Mexico in Mexico City, and a couple of pals, think that Bonilla must have been seeing fragments of a comet that had recently broken up.