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    Pluto's entire moon system is believed to have formed by a collision between the dwarf planet and another Kuiper Belt Object early in the history of the solar system. The smashup flung material that coalesced into the family of satellites observed around Pluto. "The moons form a series of neatly nested orbits, a bit like Russian dolls," said Mark Showalter of the SETI Institute. More ›

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