Danish Vulkan (planet) Cited by user Pugilist on 05 Sep 2022 Vulkan er navnet på en ikke-eksisterende planet, der i 1800-tallet blev brugt som forklaring på den afvigelse, man havde observeret for Merkurs bane rundt om Solen i…
English Vulcan (hypothetical planet) Cited by user 205.202.204.71 on 22 Feb 2022 Vulcan was a theorized planet that some 19th century astronomers thought existed in an orbit between Mercury and the Sun.