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  1. Pluto & Dwarf Planets - Science@NASA

    Apr 29, 2025 · Our solar system has five dwarf planets: In order of distance from the Sun they are: Ceres, Pluto, Haumea, Makemake, and Eris.

  2. Kuiper Belt - Science@NASA

    Mar 12, 2025 · The Kuiper Belt The Kuiper Belt is a doughnut-shaped region of icy objects beyond the orbit of Neptune. It is home to Pluto and most of the known dwarf planets and some comets.

  3. 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: Ceres, …

  4. Planet Sizes and Locations in Our Solar System - Science@NASA

    Apr 22, 2025 · Each planet’s width is compared to Earth’s equatorial diameter, which is about 7,926 miles (12,756 kilometers). At the bottom of the page, find a handy list that shows the order of the …

  5. 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 dwarf planets.

  6. Pluto and Dwarf Planet Resources - Science@NASA

    Nov 20, 2025 · A composite image showing the five dwarf planets recognized by the International Astronomical Union.

  7. Hypothetical Planet X - Science@NASA

    Mar 12, 2025 · Another possibility is that Planet X (Planet Nine) does not exist at all. Some researchers suggest the unusual orbit of those Kuiper Belt objects can be explained by their random distribution.

  8. Solar System: Facts - NASA Science

    Mar 12, 2025 · Our solar system includes the Sun, eight planets, five officially named dwarf planets, hundreds of moons, and thousands of asteroids and comets. Our solar system is located in the Milky …

  9. 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 International …

  10. Moons: Facts - Science@NASA

    May 7, 2025 · More than 470 confirmed moons orbiting other officially confirmed dwarf planets, asteroids and trans-Neptunian objects (TNOs). TNOs are objects in the solar system that have an …