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Additional
dwarf planet
English Wikipedia - The Free Encyclopedia
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Dwarf planet
A
dwarf planet
is a
planetary-mass object
that is neither a
planet
nor a
natural satellite
. That is, it is in direct orbit of the Sun, and is massive enough for its gravity to crush itself into a
hydrostatic equilibrium
shape (usually a
spheroid
), but has not
cleared the neighborhood
of other material around its orbit.
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