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 in the Solar System | ||
|---|---|---|
| Hypothetical Planets | Inner Solar System | Vulcan • Counter-Earth • Nibiru • Theia • Phaeton • Enyo and Bellona • Krypton |
| Outer Solar System | Fifth Giant • Unnamed ancient Super-earth • Triton’s Binary Partner • Planet 9 • Planet 10 • Tyche • Nemesis | |
| Hypothetical Moons | Inner Solar System | Disproven Moons of Mercury • Neith • Petit's moon • Waltemath's moons • Moons of Pallas • Moon of Hebe |
| Outer Solar System | Chiron • Chrysalis • Themis • Sedna I • Varuna I • Herschel's Moons | |
| Other Hypothetical Objects | Hypothetical Regions | Vulcanoid Belt • Hills Cloud • Oort Cloud |
| Hypotheses for Explanation of Occurrences | Hypotheses | Giant impact hypothesis • Himalia Crash Theory |