Vulcan (hypothetical planet) Vulcan (hypothetical planet) 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
Dark Planet the series' best. It was part of a second set of four books, which were successful enough to allow the range to continue. Dark Planet "Dark Planet" is a BBC Books adventure book written by Davey Moore and is based on the long-running British science fiction television series "Doctor Who". It features the Tenth Doctor and Martha. This one was set on a future version of Earth where society was split in half and some people stayed underground and the rest high above on land dangerously close to the Sun. This is part of the "Decide Your Destiny" series which