Planet X

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Is there a mysterious Planet Nine lurking in our solar system beyond Neptune? (Charlie Wood, Washington Post)
The Super Earth that Came Home for Dinner (NASA/JPL)

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Physical Realm
Universe Astronomical Instrument
Galaxy Milky Way, Andromeda
Planetary System Star, Brown Dwarf, Planet, Moon

Solar System Sun
Terrestrial Planet Mercury, Venus, Earth (Moon), Mars
Asteroid Belt Ceres, Vesta
Jovian Planet Jupiter, Saturn, Uranus, Neptune
Trans-Neptunian Object
Kuiper Belt Pluto, Haumea, Makemake
Scattered Disc Eris, Sedna, Planet X
Oort Cloud Etc. Scholz’s Star
Small Body Comet, Centaur, Asteroid

Resources

These are organized by a classification scheme developed exclusively for Cosma. More…

General

Portal

Solar System Exploration: Hypothetical Planet X (NASA)

Encyclopedia

In 1894, with the help of William Pickering, Percival Lowell, a wealthy Bostonian, founded the Lowell Observatory in Flagstaff, Arizona. In 1906, convinced he could resolve the conundrum of Uranus’s orbit, he began an extensive project to search for a planet beyond Neptune, which he named Planet X, a name previously used by Gabriel Dallet. The X in the name represents an unknown and is pronounced as the letter, as opposed to the Roman numeral for 10 (at the time, and now, Planet X would be the ninth planet). — Wikipedia

Science





Caltech Researchers Find Evidence of a Real Ninth Planet (Caltech)
Solar Obliquity Induced by Planet Nine (Elizabeth Bailey, Konstantin Batygin, Michael E. Brown, arXiv.org)

Hypothesis




Library

WorldCat, Library of Congress, UPenn Online Books, Open Library

Community

Organization

International Astronomical Union (IAU)
Minor Planet Center (International Astronomical Union)

News

Phys.org, NPR Archives

Book

ISBNdb

Government

Document

USA.gov

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Phys.org - latest science and technology news stories Phys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.

  • Why astronomers now doubt there is an...
    on May 26, 2020 at 11:53 am

    Planet Nine is a theoretical, undiscovered giant planet in the mysterious far reaches of our solar system.

  • Could theorized Planet 9 be a primordial black...
    on May 25, 2020 at 1:26 pm

    There are eight classical planets in our solar system, from speedy Mercury to distant Neptune. There are also numerous dwarf planets, such as Pluto and Ceres. While we continue to find more dwarf planets, there are some hints that another large planet could lurk far beyond Neptune. This Planet Nine is thought to be a "super-Earth," about five times the mass of our planet, which would make it about twice as large as Earth. But despite several searches for the planet, it has not yet been found.

  • New study estimates the odds of life and...
    on May 19, 2020 at 7:04 am

    Humans have been wondering whether we alone in the universe since antiquity.

  • Discovery of unknown hydrogen in mid-ocean ridge...
    on May 18, 2020 at 1:50 pm

    By providing the first estimate of how much hydrogen is available to fuel microbial life in the sunless sub-seafloor crust beneath the Mid-Ocean Ridge (MOR), a new Duke University-led study sheds light on one of Earth's least understood biospheres.

  • Study suggests remnants of Bering Strait and...
    on May 12, 2020 at 2:52 pm

    Today, sea-level rise is a great concern of humanity as climate change warms the planet and melts ice sheets in Greenland and Antarctica. Indeed, great coastal cities around the world like Miami and New Orleans could be underwater later in this century.