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  2. Fifth planet (hypothetical) - Wikipedia

    en.wikipedia.org/wiki/Fifth_planet_(hypothetical)

    Ceres, the only dwarf planet in the asteroid belt, was once categorized as a planet. In the history of astronomy, a handful of Solar System bodies other than Jupiter have been counted as the fifth planet from the Sun. Various hypotheses have also postulated the former existence of a fifth planet, now destroyed, to explain various ...

  3. PlanetMath - Wikipedia

    en.wikipedia.org/wiki/PlanetMath

    PlanetMath is a free, collaborative, mathematics online encyclopedia.Intended to be comprehensive, the project is currently hosted by the University of Waterloo.The site is owned by a US-based nonprofit corporation, "PlanetMath.org, Ltd".

  4. Planetary coordinate system - Wikipedia

    en.wikipedia.org/wiki/Planetary_coordinate_system

    Chart of lunar maria with lines of longitude and latitude. The prime meridian is the centre of the near side of the Moon.. A planetary coordinate system (also referred to as planetographic, planetodetic, or planetocentric) [1] [2] is a generalization of the geographic, geodetic, and the geocentric coordinate systems for planets other than Earth.

  5. Fifth planet - Wikipedia

    en.wikipedia.org/wiki/Fifth_planet

    Jupiter, fifth planet from the Sun in our Solar System; Fifth planet (hypothetical), any of various hypothetical planets thought to have existed; Planet V, 2002 scientific proposal for a destroyed fifth planet; Mars, fifth planet from Earth in the Ptolemaic geocentric model; Ceres (dwarf planet), dwarf planet between Mars and Jupiter in the ...

  6. Earth - Wikipedia

    en.wikipedia.org/wiki/Earth

    About 97.5% of the water is saline; the remaining 2.5% is fresh water. [ 196 ] [ 197 ] Most fresh water, about 68.7%, is present as ice in ice caps and glaciers . [ 198 ] The remaining 30% is ground water , 1% surface water (covering only 2.8% of Earth's land) [ 199 ] and other small forms of fresh water deposits such as permafrost , water ...

  7. Hemispheres of Earth - Wikipedia

    en.wikipedia.org/wiki/Hemispheres_of_Earth

    The division of Earth by the Equator and the prime meridian Map roughly depicting the Eastern and Western hemispheres. In geography and cartography, hemispheres of Earth are any division of the globe into two equal halves (hemispheres), typically divided into northern and southern halves by the Equator and into western and eastern halves by the Prime meridian.

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