Counter-Earth

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Counter-Earth, also known as Antichthon, is a hypothetical body of the Solar system hypothesized by the pre-Socratic Greek philosopher Philolaus (c. 470 – c. 385 BC) to support his non-geocentric cosmology, in which all objects in the universe revolve around an unseen "Central Fire" (distinct from the Sun which also revolves around it). It is said to be in the same orbit as Earth.

Gallery[]

Hypothetical Bodies, Hypothetical Objects, Hypothetical Regions and Hypotheses
Hypothetical planets	Inner Solar System	Enyo and Bellona • Vulcan • Counter-Earth • Nibiru • Theia • Phaeton • Planet V • Krypton
Hypothetical planets	Outer Solar System	Fifth Giant • Uranus Impactor • Triton’s Binary Partner • Haumea Impactor • Quaoar Impactor • Brahma • Vishnu • Oceanus • Hades • Planet Nine • Planet Ten • Rodney's Planet • Planet X • Pickering's Planets • Trans-Plutonian planet • Tyche • Oort cloud planet
Hypothetical Moons	Inner Solar System	Disproven Moons of Mercury • Neith • Petit's moon • Waltemath's moons • Bagby's Moons • Moons of Pallas • Moon of Hebe
Hypothetical Moons	Outer Solar System	Chiron • Chrysalis • Themis • Sedna I • Varuna I • Herschel's Moons
Hypothetical Stellar Objects		Nemesis • Coatlicue
Hypothetical Regions		Vulcanoid Belt • Hills Cloud • Oort cloud
Hypotheses and Models		Himalia Crash Theory • Iapetus' Ring System • Nibiru cataclysm • Rings of the Moon