#8
New Horizons
New Horizons' 2015 flyby of Pluto revealed a geologically active world 4.8 billion kilometers from Earth, capturing nitrogen ice glaciers and a 1,000-kilometer-wide heart-shaped plain. The mission cost just $780 million, a bargain that delivered 50 gigabits of data on Pluto's five moons, including direct evidence of cryovolcanism.
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