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This object is hypothetical.
This object is hypothetical, and was proposed to explain a phenomenon or occurrence. Note that such object has not been discovered or observed.
This object does not exist.
This object has been proven to not exist by further study. Please take it lightly and with a grain of salt.


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" after he was satisfied by the sighting of supposed transit of Vulcan by physician named "Lescarbault".[1] Later the theoretical object got attention to explain why is there no mass between the orbit of Mercury and the Sun, but it was not found. The “anomalies” of Mercury were later explained by Einstein’s theory of relativity about a century later.

Despite the ruling out of Vulcan, there have been propositions of small objects that orbit the Sun within the orbit of Mercury. These are known as Vulcanoids, which may actually exist.

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Hypothetical Bodies, Hypothetical Objects, Hypothetical Regions and Hypotheses
Hypothetical planets Inner Solar System Enyo and BellonaVulcanCounter-EarthNibiruTheiaPhaetonPlanet VKrypton
Outer Solar System Fifth GiantUranus ImpactorTriton’s Binary PartnerHaumea ImpactorQuaoar ImpactorBrahmaVishnuOceanusHadesPlanet NinePlanet TenRodney's PlanetPlanet XPickering's PlanetsTrans-Plutonian planetTycheOort cloud planet
Hypothetical Moons Inner Solar System Disproven Moons of MercuryNeithPetit's moonWaltemath's moonsBagby's MoonsMoons of PallasMoon of Hebe
Outer Solar System ChironChrysalisThemisSedna IVaruna IHerschel's Moons
Hypothetical Stellar Objects NemesisCoatlicue
Hypothetical Regions Vulcanoid BeltHills CloudOort cloud
Hypotheses and Models Himalia Crash TheoryIapetus' Ring SystemNibiru cataclysmRings of the Moon