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Vulcan
Vulcan spacepedia
Artist's impression of Vulcan.

Date of Discovery

1840 (Claimed)

Vulcan is a small hypothetical planet that was proposed to exist in an orbit between Mercury and the Sun. Attempting to explain peculiarities of Mercury's orbit, the 19th-century French mathematician Urbain Le Verrier hypothesized that they were the result of another planet, which he named "Vulcan".

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