Vulcan (hypothetical planet) | Wikipedia audio article
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Date: 18/11/2018

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Vulcan (hypothetical planet)

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SUMMARY
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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".
A number of reputable investigators became involved in the search for Vulcan, and despite occasional claimed observations,  no such planet was ever confirmed. Peculiarities in Mercury's orbit have now been explained by Albert Einstein's theory of general relativity. Searches of data gathered by NASA's two STEREO spacecraft have failed to find any vulcanoids that could have accounted for claimed observations of Vulcan. It is doubtful that there are any vulcanoids larger than 5.7 kilometres (3.5 mi) in diameter. There are a number of Mercury-crossing asteroids, but all have a semi-major axis larger than Mercury's.