Vulcan (hypothetical planet)
vulcan-hypothetical-planet-1752771307610-3dbeaa
Description
Vulcan was a proposed planet that some pre-20th century astronomers thought existed in an orbit between Mercury and the Sun. Speculation about, and even purported observations of, intermercurial bodies or planets date back to the beginning of the 17th century.
ID: vulcan-hypothetical-planet-1752771307610-3dbeaa
