Scientists struggle to explain perplexing features revealed by the first close-up of the icy body's surface.
Pluto
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Long-Traveled Spacecraft Buzzes Pluto in Close Flyby
Successful flyby of Pluto completes the first era of planetary reconnaissance, NASA Administrator Charles Bolden says.
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Pluto-Bound Spacecraft Crosses Orbit of Neptune
NASA’s New Horizons spacecraft, which is en route to explore Pluto and its planetary system in 2015, crossed the orbit of Neptune on 25 August.