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  2. Planet Nine - Wikipedia

    en.wikipedia.org/wiki/Planet_Nine

    Planet Nine is a hypothetical ninth planet in the outer region of the Solar System. [4] [2] Its gravitational effects could explain the peculiar clustering of orbits for a group of extreme trans-Neptunian objects (ETNOs), bodies beyond Neptune that orbit the Sun at distances averaging more than 250 times that of the Earth i.e. over 250 astronomical units (AU).

  3. Planets beyond Neptune - Wikipedia

    en.wikipedia.org/wiki/Planets_beyond_Neptune

    The oligarch theory of planet formation states that there were hundreds of planet-sized objects, known as oligarchs, in the early stages of the Solar System's evolution. In 2005, astronomer Eugene Chiang speculated that although some of these oligarchs became the planets we know today, most would have been flung outward by gravitational ...

  4. New study reveals the possibility of a new ninth planet - AOL

    www.aol.com/astronomers-still-looking-elusive...

    A study re-examines the evidence for a proposal first suggested in 2016 — that the hypothetical Planet 9 could explain anomalies seen by astronomers in the outer solar system.

  5. List of hypothetical Solar System objects - Wikipedia

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

    The Fifth Giant may be hypothetical Planet Nine due to either the gravity of a nearby star or drag from the gaseous remnants of the Solar nebula which reduced the eccentricity of its orbit. A and B, two super-Earth (or even supergiant) planets theorized by Michael Woolfson as part of his Capture theory on Solar System formation. Originally the ...

  6. Planet nine may be orbiting far from the Sun, at the edge of our solar system. Astronomers, seeing odd irregularities in the orbits of the outer planets suspect another, unknown, planet may orbit ...

  7. A mysterious planet may be hiding at the edge of our solar system

    www.aol.com/mysterious-planet-may-hiding-edge...

    A mysterious planet — called Planet 9 or Planet X — may be hiding at the edge of our solar system. Planet nine may be orbiting far from the Sun, at the edge of our solar system. Astronomers ...

  8. Percival Lowell - Wikipedia

    en.wikipedia.org/wiki/Percival_Lowell

    Percival Lowell (/ ˈ l oʊ əl /; March 13, 1855 – November 12, 1916) was an American businessman, author, mathematician, and astronomer who fueled speculation that there were canals on Mars, and furthered theories of a ninth planet within the Solar System.

  9. Historical models of the Solar System - Wikipedia

    en.wikipedia.org/wiki/Historical_models_of_the...

    The ancient Hebrews, like all the ancient peoples of the Near East, believed the sky was a solid dome with the Sun, Moon, planets and stars embedded in it. [4] In biblical cosmology, the firmament is the vast solid dome created by God during his creation of the world to divide the primal sea into upper and lower portions so that the dry land could appear.