![]() ![]() "At the Center of Gravity" ( Astounding Stories, June 1936), short story by Ross Rocklynne: two people are trapped inside a hollow Vulcan."Vulcan's Workshop" ( Astounding Stories, June 1932), short story by Harl Vincent: a penal colony is located on Vulcan. ![]() The planet was proposed as a hypothesis in 1859, and abandoned not later than 1915. Vulcan was a hypothetical planet supposed to revolve around the Sun inside the orbit of Mercury, invoked to explain certain irregularities in Mercury's orbit. Main article: Vulcan (hypothetical planet)
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