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  1. nasa.gov
    https://science.nasa.gov › dwarf-planets › pluto › facts

    Pluto Facts - NASA Science

    Apr 22, 2025 · Discovered in 1930, Pluto was long considered our solar system's ninth planet. But after the discovery of similar worlds deeper in the Kuiper Belt, Pluto was reclassified as a …

  2. nasa.gov
    https://science.nasa.gov › dwarf-planets › pluto

    Pluto - Science@NASA

    Apr 29, 2025 · Pluto is a dwarf planet located in a distant region of our solar system beyond Neptune known as the Kuiper Belt. Pluto was long considered our ninth planet, but the …

  3. nasa.gov
    https://science.nasa.gov › dwarf-planets

    Pluto & Dwarf Planets - Science@NASA

    Apr 29, 2025 · Discovered by Clyde Tombaugh in 1930, Pluto was long considered our solar system's ninth planet. But after other astronomers found similar intriguing worlds deeper in the …

  4. nasa.gov
    https://science.nasa.gov › ... › pluto-dwarf-planet-resources

    Pluto and Dwarf Planet Resources - Science@NASA

    Aug 26, 2025 · The International Astronomical Union (IAU) has recognized five dwarf planets: Pluto, Ceres, Haumea, Makemake, and Eris. But there may be many more waiting to be …

  5. nasa.gov
    https://science.nasa.gov › mission › new-horizons

    New Horizons - Science@NASA

    May 15, 2025 · New Horizons is a NASA mission to study the dwarf planet Pluto, its moons, and other objects in the Kuiper Belt, a region of the solar system that extends from about 30 AU, …

  6. nasa.gov
    https://science.nasa.gov › solar-system › planets › what-is-a-planet

    What is a Planet? - Science@NASA

    Mar 12, 2025 · Eris, Ceres, Pluto, and two more recently discovered KBOs named Haumea and Makemake, are the dwarf planets recognized by the IAU. There may be another 100 dwarf …

  7. nasa.gov
    https://science.nasa.gov › dwarf-planets › makemake

    Makemake Facts - Science@NASA

    Apr 24, 2025 · Dwarf planet Makemake – along with Pluto, Haumea, and Eris – is located in the Kuiper Belt, a donut-shaped region of icy bodies beyond the orbit of Neptune.

  8. nasa.gov
    https://science.nasa.gov › dwarf-planets › eris

    Eris - Science@NASA

    Apr 24, 2025 · The new ruling reclassifies Pluto as a dwarf planet and reduces the number of planets in the solar system to eight. Both Eris and the asteroid Ceres are also classified as …

  9. nasa.gov
    https://science.nasa.gov › solar-system › planets

    About the Planets - Science@NASA

    May 28, 2025 · Our solar system has eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. There are five officially recognized dwarf planets in our solar system: …

  10. nasa.gov
    https://science.nasa.gov › resource › kuiper-belt-in-depth

    Kuiper Belt: In Depth - NASA Science

    Nov 30, 2017 · Instead, in 2006, the International Astronomical Union created a new class of objects called dwarf planets, and placed Pluto, Eris and the asteroid Ceres in this category.