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Created with Fabric.js 1.4.5 Pluto Pluto 1930-2006 REVOLVE IN PEACE Pluto (minor-planet designation: 134340 Pluto) is the largest object in the Kuiper belt, [i] [j] the tenth-most-massive known body directly orbiting the Sun, and the second-most-massive known dwarf planet, after Eris. Appearance: Our best images are blurred ones from the HST; Covered with nitrogen frost, with markings from complex molecules. Size and rotation: 1/5 Earth radii [about 2300 km across]; We know size and mass [0.0025 Earth masses and 0.06 of its gravity] because of Charon eclipses; Very tilted, retrograde rotation. If you were to take a walk around the equator of Pluto, you would travel 4,494 miles (7,232 km). That is only about 1,400 miles farther than a trip across the United States, from Augusta, Maine, to Los Angeles, Calif. Pluto is only 1,430 miles (2,302 kilometers) in diameter and is about 1/6th the size of Earth. Pluto is actually smaller than our own Moon! Although all of the planets beyond Mars are gas giants, Pluto is small and rocky. The tiny body has a mass of only 1.31 x 1022 kilograms, about two-tenths of a percent of Earth's. It has a volume of 1.5 billion cubic miles (6.4 billion cubic km).Pluto's small size and low mass mean that it has a density of 2.05 grams per cubic centimeter, about 40 percent of Earth's density. Facts About PlutoPluto is named after the Greek god of the underworld:This is a later name for the more well known Hades and was proposed by Venetia Burney an eleven year old schoolgirl from Oxford, England.Pluto was reclassified from a planet to a dwarf planet in 2006:This is when the IAU formalised the definition of a planet as “A planet is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit.”Pluto was discovered on February 18th, 1930 by the Lowell Observatory:For the 76 years between Pluto being discovered and the time it was reclassified as a dwarf planet it completed under a third of its orbit around the Sun.Pluto has five known moons:They are Charon (discovered in 1978,), Hydra and Nix (both discovered in 2005), Kerberos originally P4 (discovered 2011) and Styx originally P5 (discovered 2012) official designations S/2011 (134340) 1 and S/2012 (134340) 1.Pluto may be the largest dwarf planet:Or it could be Eris. Currently the most accurate measurements give Eris an average diameter of 2,326km with a margin of error of 12km, while Pluto’s diameter is 2,368km with a 20km margin of error, however due to Pluto’s atmosphere it is difficult to say for certain.Pluto is smaller than a number of moons:These are Ganymede, Titan, Callisto, Io, Europa, Triton, and the Earth’s moon. Pluto has 66% of the diameter of the Earth’s moon and 18% of its mass.Pluto has a eccentric and inclined orbit:This takes it between 4.4 and 7.4 billion km from the Sun meaning Pluto is periodically closer to the Sun than Neptune.No spacecraft have visited Pluto:Though in July 2015 the spacecraft New Horizons, which was launched in 2006, is scheduled to fly by Pluto on its way to the Kuiper Belt.Pluto’s location was predicted by Percival Lowell in 1915:The prediction came from deviations he initially observed in 1905 in the orbits of Uranus and Neptune.Pluto sometimes has an atmosphere:During Pluto’s elliptical when Pluto is closer to the Sun its surface ice thaws and forms a thin atmosphere primarily of nitrogen with a little methane and carbon monoxide. When Pluto travels away from the Sun the atmosphere then freezes back to its solid state. Facts About PlutoPluto is named after the Greek god of the underworld:This is a later name for the more well known Hades and was proposed by Venetia Burney an eleven year old schoolgirl from Oxford, England.Pluto was reclassified from a planet to a dwarf planet in 2006:This is when the IAU formalised the definition of a planet as “A planet is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit.”Pluto was discovered on February 18th, 1930 by the Lowell Observatory:For the 76 years between Pluto being discovered and the time it was reclassified as a dwarf planet it completed under a third of its orbit around the Sun.Pluto has five known moons:They are Charon (discovered in 1978,), Hydra and Nix (both discovered in 2005), Kerberos originally P4 (discovered 2011) and Styx originally P5 (discovered 2012) official designations S/2011 (134340) 1 and S/2012 (134340) 1.Pluto may be the largest dwarf planet:Or it could be Eris. Currently the most accurate measurements give Eris an average diameter of 2,326km with a margin of error of 12km, while Pluto’s diameter is 2,368km with a 20km margin of error, however due to Pluto’s atmosphere it is difficult to say for certain.Pluto is smaller than a number of moons:These are Ganymede, Titan, Callisto, Io, Europa, Triton, and the Earth’s moon. Pluto has 66% of the diameter of the Earth’s moon and 18% of its mass.Pluto has a eccentric and inclined orbit:This takes it between 4.4 and 7.4 billion km from the Sun meaning Pluto is periodically closer to the Sun than Neptune.No spacecraft have visited Pluto:Though in July 2015 the spacecraft New Horizons, which was launched in 2006, is scheduled to fly by Pluto on its way to the Kuiper Belt.Pluto’s location was predicted by Percival Lowell in 1915:The prediction came from deviations he initially observed in 1905 in the orbits of Uranus and Neptune.Pluto sometimes has an atmosphere:During Pluto’s elliptical when Pluto is closer to the Sun its surface ice thaws and forms a thin atmosphere primarily of nitrogen with a little methane and carbon monoxide. When Pluto travels away from the Sun the atmosphere then freezes back to its solid state.
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