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  2. List of former planets - Wikipedia

    en.wikipedia.org/wiki/List_of_former_planets

    When discovered, Charon, the moon of Pluto, was found to be very large, leading to the declaration by many that the Pluto-Charon system was a double planet (binary planet). The 2006 IAU redefinition of planet excludes the possibility of double planets. [24] [25] [26] 15760 Albion: 1992 unknown Trans-Neptunian object

  3. Planets beyond Neptune - Wikipedia

    en.wikipedia.org/wiki/Planets_beyond_Neptune

    Four test orbits of a trans-Plutonian planet have been integrated forward for four million years in order to determine the effects of such a body on the stability of the Neptune–Pluto 3:2 resonance. Planets beyond Pluto with masses of 0.1 and 1.0 Earth masses in orbits at 48.3 and 75.5 AU, respectively, do not disturb the 3:2 resonance.

  4. 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 ...

  5. Kuiper belt - Wikipedia

    en.wikipedia.org/wiki/Kuiper_belt

    Thus, just as Ceres was considered a planet before the discovery of its fellow asteroids, some began to suggest that Pluto might also be reclassified. The issue was brought to a head by the discovery of Eris, an object in the scattered disc far beyond the Kuiper belt, that is now known to be 27% more massive than Pluto. [111]

  6. Eris (dwarf planet) - Wikipedia

    en.wikipedia.org/wiki/Eris_(dwarf_planet)

    Under the IAU definition approved on August 24, 2006, Eris, Pluto and Ceres are "dwarf planets", [26] reducing the number of known planets in the Solar System to eight, the same as before Pluto's discovery in 1930.

  7. Pluto - Wikipedia

    en.wikipedia.org/wiki/Pluto

    Pluto (minor-planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, ... The mass is much less than thought before Charon was discovered. [127]

  8. Lists of planets - Wikipedia

    en.wikipedia.org/wiki/Lists_of_planets

    These are lists of planets.A planet is a large, rounded astronomical body that is neither a star nor its remnant. The best available theory of planet formation is the nebular hypothesis, which posits that an interstellar cloud collapses out of a nebula to create a young protostar orbited by a protoplanetary disk.

  9. Vulcan (hypothetical planet) - Wikipedia

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

    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.