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Knocking on Pluto’s door

After nine long years in space, the New Horizons spacecraft will soon fly past Pluto. Richard A. Lovett reports.  

Artist’s impression of Pluto’s mottled surface. Pluto is so distant from the Sun that it only receives slightly more light than the Earth on moonlit nights.
Artist’s impression of Pluto’s mottled surface. Pluto is so distant from the Sun that it only receives slightly more light than the Earth on moonlit nights.