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The planet pluto was discovered by Clyde Tombaugh
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In 1978 it was discovered that Pluto had a moon nearly half its size Charon.
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The Pioneer 10 spacecraft crossed Pluto's orbit, speeding on its endless voyage through the Milky Way.
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2005 pluto had two more moons Nix and Hydra
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NASA launched its New Horizons spacecraft on a mission to Pluto following a 2-day delay. Scientists won't be able to receive data on Pluto until at least July 2015, the earliest date the mission is expected to arrive.
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The journal Nature reported that object UB313 is larger than Pluto according to German heat calculations.
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2006 it was declassified as a planet.
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In 2011 the fourth moon P4 was discovered.