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
Stowaway to the Mushroom Planet Stowaway to the Mushroom Planet " Stowaway to the Mushroom Planet "is the second in the series of "Mushroom Planet" books by Eleanor Cameron, and was published in 1956, two years after "The Wonderful Flight to the Mushroom Planet". This children's book is set in a beach community in California, as well as on a tiny, habitable moon, "Basidium", in an invisible orbit 50,000 miles from Earth. The "Mushroom Planet," visited by the protagonists David and Chuck, is covered in various types of mushrooms and is populated by little green people. The story opens with Theo Bass, the cousin of