Pluto: Introduction: Pluto is a dwarf planet in the Kuiper belt, a ring of planets beyond Neptune's orbit. Its minor-planet name is 134340 Pluto. It directly orbits the Sun and is the ninth-largest and tenth-most massive object known to exist. It is marginally bigger than Eris in terms of mass, but it is the largest trans-Neptunian object by volume. Pluto is significantly smaller than the inner planets and is mostly formed of ice and rock, like other Kuiper belt objects. Pluto has only one-sixth the mass and one-third the volume of the moon of Earth. Pluto Pluto's orbit, which ranges from 30 to 49 astronomical units (4.5 to 7.3 billion kilometers; 2.8 to 4.6 billion miles) from the Sun, is fairly eccentric and inclined. At its typical distance, light from the Sun takes 5.5 hours to reach Pluto (39.5 AU [5.91 billion km; 3.67 billion mi]). Although Pluto's eccentric orbit occasionally gets it closer to the Sun than Neptune, their paths are kept apart by a steady orbital ...
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