Counter-Earth

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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, e.g. at the L3 Lagrange point of the Sun–Earth system. 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 (πῦρ μέσον, pŷr méson) 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, and has been a recurring theme in UFO claims, as well as in fiction (particularly science fiction).

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