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  2. Planets beyond Neptune - Wikipedia

    en.wikipedia.org/wiki/Planets_beyond_Neptune

    In 1909, Thomas Jefferson Jackson See, an astronomer with a reputation as an egocentric contrarian, opined "there is certainly one, most likely two and possibly three planets beyond Neptune". [15] Tentatively naming the first planet "Oceanus", he placed their respective distances at 42, 56 and 72 AU from the Sun.

  3. Neptune - Wikipedia

    en.wikipedia.org/wiki/Neptune

    From its discovery in 1846 until the discovery of Pluto in 1930, Neptune was the farthest known planet. When Pluto was discovered, it was considered a planet, and Neptune thus became the second-farthest known planet, except for a 20-year period between 1979 and 1999 when Pluto's elliptical orbit brought it closer than Neptune to the Sun, making ...

  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. 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]

  6. 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 ...

  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. 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.

  9. Zecharia Sitchin - Wikipedia

    en.wikipedia.org/wiki/Zecharia_Sitchin

    Zecharia Sitchin (July 11, 1920 – October 9, 2010) [1] was an author of a number of books proposing an explanation for human origins involving ancient astronauts.Sitchin attributed the creation of the ancient Sumerian culture to the Anunnaki, which he claimed was a race of extraterrestrials from a planet beyond Neptune called Nibiru.

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