Dwarf Planet Ceres Map

According to the IAU, a dwarf planet is a planetary-mass object that does not gravitationally dominate its region of space (as larger planets do) and is not a satellite. That is, it is in direct orbit of its star and is massive enough to be plastic – for its gravity to maintain it in a hydrostatically equilibrious shape (usually a spheroid) – but has not cleared the neighborhood around its orbit of other material. . A common[citation needed] alternative to the IAU definition of a dwarf planet is that dwarf planets are round by gravitational hydrostatic equilibrium just as larger planets, but are smaller than the terrestrial planet Mercury.

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