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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.ere's how Resolution 5A defines a planet: Pluto is relatively round and orbits the sun, but it does not meet the criteria because its orbit crosses Neptune's orbit. Critics of the resolution argue that other planets in the solar system, including Earth, have not cleared the neighborhood around their orbits.