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The New Horizons mission has been launched to Pluto. It is the first time a spacecraft has been sent to an unexplored world since the Voyager 2 craft visited Neptune in the late 1980s. New Horizons' trip to Pluto and the Kuiper Belt Objects will cover uncharted territory in the exploration of the Solar System.

2007-02-27

 planet Pluto New Horizons Neptune Kuiper Belt
Neptune is about to celebrate its first birthday. On 12 July it will be exactly one Neptunian year - or 164.79 Earth years - since its discovery on 24 September 1846.

2011-07-11

 Neptune planet Solar System discovery orbit mathematics gravity year