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Venetia Burney, an
, named 'Pluto'.
five known moons
: Charon, Styx, Nix, Kerberos, and Hydra.
is the only spacecraft to visit this distant world.
Pluto is slightly larger than Eris in size, but
Eris is greater in mass
. This is due to the disparity in their densities.
Pluto's orbit is
. When it is closest to the sun, it is 4.4 billion kilometers away, and when it is farthest from the sun, it is 7.3 billion kilometers away.
Pluto is the largest and
second most massive
The location of Pluto was predicted by
- 15 years before its discovery.
In 2006, the
International Astronomical Union
reclassified Pluto as a dwarf planet.
even smaller than the moons
, Io, Europa, Triton, and the Earth’s moon.
Every 248 earth years, Pluto
comes closer to the sun
than Neptune for 20 years.