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When NASA's New Horizons Pluto probe launched on January 19, 2006, Pluto was still officially considered a planet. By the end of 2006, it was no longer ranked alongside Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. It had been downgraded to the status of a dwarf planet.
Since its discovery in 1930, Pluto has been a bit of a puzzle: 1  It's smaller than any other planet -- even smaller than Earth 's moon. 2  It's dense and rocky, like the terrestrial planets (Mercury, Venus, Earth and Mars). 3  Pluto's orbit is erratic. 4  One of its moons, Charon, is about half Pluto's size. 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 [sic] around its orbit [ref].