Counter-Earth
Hypothetical planet on the other side of the Sun from Earth / From Wikipedia, the free encyclopedia
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The Counter-Earth is a hypothetical body of the Solar System that orbits on the other side of the Solar System from Earth. A Counter-Earth or Antichthon (Greek: Ἀντίχθων) was 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 a "Central Fire" (unseen from Earth and distinct from the Sun which also revolves around it).
In modern times a hypothetical planet always on the other side of the Sun from Earth has been called a "Counter-Earth",[2] and has been a recurring theme in UFO claims,[3] as well as in fiction (particularly science fiction).