Ceres, Eris and Pluto are ...?

dwarf planets
683
gaseous planets
84
comets
134
objects similar to Earth
48
A dwarf planet is a planetary-mass object that is neither a planet nor a natural satellite. Pluto, Eris, Ceres, Humia, Make Make are a five known dwarf planets. Astronomers believe there are at least 50 dwarf planets in our Solar system
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