A dwarf planet is a spherical celestial entity orbiting the Sun that is comparable to a planet but is not big enough to clear its orbital area or other celestial bodies. How many of these planets are there in the Solar System?

The International Astronomical Union officially acknowledges five dwarf planets in the Solar System: Pluto, Eris, Ceres, Makemake, and Haumea. Several dozen more are being evaluated for the category, and astronomers believe that the Solar System may include hundreds or, perhaps, thousands of dwarf planets.

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