Discovered in 1930, Pluto is the second closest dwarf planet to the Sun and was at one point classified as the ninth planet. Pluto is the largest dwarf planet but only the second most massive, with Eris being the most massive.
Pluto’s Fifth Moon The Hubble Telescope has discovered a fifth moon in orbit around Pluto. This adds to its current satellites Charon, Nix, Hydra and the unnamed.
Eris Facts Eris is the most distant dwarf planet from the Sun and has the greatest mass. Eris is the second largest dwarf planet (very a.
Charon Moon Facts Charon is the largest and innermost moon of Pluto. It was discovered in 1978 by astronomer James Christy and is nearly 1/8 the mass.
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The distant, ice-covered world is no longer a true planet, according to a new definition of the term voted on by scientists today.
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After 76 years of classification as a planet, Pluto was demoted in 2006 to a dwarf planet, in part because of its size but also because of its minor gravitational effects on the bodies around it. When NASA s New Horizons mission visited in 2015, it took the most accurate measurement of the world, revealing it to be larger than previously thought, but still not large enough to be qualified as full-grown planet. Pluto remains one of the most well-known non-planetary bodies in the solar system.
When New Horizons arrived at Pluto, it measured the diameter of the world to be 1,473 miles (2,370 kilometers) across, about two-thirds the diameter of Earth s moon. This makes it larger than the dwarf planet Eris, once thought to be larger than Pluto. Eris is 1,445 miles (2,326 km) in diameter.
This settles the debate about the largest object in the solar system [beyond Neptune], New Horizons principal investigator Alan Stern of the Southwest Research Institute in Boulder, Colorado, said during a NASA press briefing reviewing the mission flyby. [ See a video of Alan Stern discussing Pluto s size ]
Unlike many of the planets in the solar system, such as Earth, Pluto does not bulge at its center; its radius 1,185 km (737 miles) is the same at its poles and at its equator.
Circumference : If you were to take a walk around the equator of Pluto, you would travel about 4,627 miles (7,445 km). That is just a bit less than the distance from Denver to London (4,683 miles).
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