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2. Planets beyond Neptune - Wikipedia

   en.wikipedia.org/wiki/Planets_beyond_Neptune

   The search began in the mid-19th century and continued at the start of the 20th with Percival Lowell's quest for Planet X. Lowell proposed the Planet X hypothesis to explain apparent discrepancies in the orbits of the giant planets, particularly Uranus and Neptune, [2] speculating that the gravity of a large unseen ninth planet could have ...

3. Hyperion (hypothetical planet) - Wikipedia

   en.wikipedia.org/wiki/Hyperion_(hypothetical_planet)

   The Kuiper belt, a region of the Solar System beyond Neptune, contains numerous small icy bodies. Its structure, including the sudden drop-off in the number of objects beyond 48 AU—known as the "Kuiper cliff"—has puzzled astronomers. The existence of a planet-sized object beyond Neptune was proposed to account for these observations. [1]

4. Discovery of Neptune - Wikipedia

   en.wikipedia.org/wiki/Discovery_of_Neptune

   As of 2024, no large planet has been found beyond Neptune that would explain any alleged discrepancy, despite the discovery of trans-Neptunian objects (most notably, Pluto). While the astronomical community widely agrees that "Planet X", as originally envisioned, does not exist, the concept of an as-yet-unobserved planet has been revived by a ...

5. Fictional planets of the Solar System - Wikipedia

   en.wikipedia.org/wiki/Fictional_planets_of_the...

   Additional planets in the outer reaches of the Solar System, such as a ninth planet beyond Neptune or especially a tenth beyond Pluto (between the 1930 discovery of Pluto and its reclassification from planet to dwarf planet in 2006), appear regularly. Many different names for this hypothetical outermost planet have been used, the most common ...

6. Vulcan (hypothetical planet) - Wikipedia

   en.wikipedia.org/wiki/Vulcan_(hypothetical_planet)

   Vulcan in a lithographic map from 1846 [1] Vulcan (/ ˈ v ʌ l k ən /) [2] was a proposed planet that some pre-20th century astronomers thought existed in an orbit between Mercury and the Sun. Speculation about, and even purported observations of, intermercurial bodies or planets date back to the beginning of the 17th century.

7. List of hypothetical Solar System objects - Wikipedia

   en.wikipedia.org/wiki/List_of_hypothetical_Solar...

   Planet V, a planet thought by John Chambers and Jack Lissauer to have once existed between Mars and the asteroid belt, based on computer simulations. Various planets beyond Neptune: Planet Nine, a planet proposed to explain apparent alignments in the orbits of a number of distant trans-Neptunian objects. Planet X, a hypothetical planet beyond ...

8. Timeline of discovery of Solar System planets and their moons

   en.wikipedia.org/wiki/Timeline_of_discovery_of...

   The timeline of discovery of Solar System planets and their natural satellites charts the progress of the discovery of new bodies over history. Each object is listed in chronological order of its discovery (multiple dates occur when the moments of imaging, observation, and publication differ), identified through its various designations (including temporary and permanent schemes), and the ...

9. Kenneth Edgeworth - Wikipedia

   en.wikipedia.org/wiki/Kenneth_Edgeworth

   Edgeworth is best known for proposing the existence of a disc of bodies beyond the orbit of Neptune in the 1930s. Observations later confirmed the existence of the Edgeworth-Kuiper belt in 1992. Those distant solar system bodies, including Pluto, Eris and Makemake, are now grouped into the Edgeworth-Kuiper belt, or Kuiper belt. [3]