1 Jan 1859 Jahr - Pseudo-Planet (1859) Urbain Le Verrier observed the strange orbit of Mercury. He proposed that a planet called "Vulcan" must exist, and would account for the oddities of Mercury's orbit. No such planet would ever be observed, but rather Einstein's theories would later explain the observations.

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Gravity Timeline

ByRon Berglund

28 Feb 2020

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