Pluto has gravity.
Dwarf planet . That is , it is in direct orbit of the Sun , and is massive enough for its gravity to crush it into a hydrostatic equilibrium shape ( usually a spheroid ) , but has not cleared the neighborhood of other material around its orbit . Pluto ( minor-planet designation : 134340 Pluto ) is a dwarf planet in the Kuiper belt , a ring of bodies beyond Neptune . Pluto is the largest and second-most-massive known dwarf planet in the Solar System and the ninth-largest and tenth-most-massive known object directly orbiting the Sun . Like other Kuiper belt objects , Pluto is primarily made of ice and rock and is relatively small -- about one-sixth the mass of the Moon and one-third its volume .