New Horizons is a NASA spacecraft launched in 2006. It's main mission is to visit Pluto and it's moon Charon and to reach the Kuiper Belt.
On February 28'th, New Horizons came to within 2.3 million kilometers from Jupiter, using the planet's gravity to trim 3 years from it's journey to Pluto. During it's approach to the Jupiter system, New Horizons stored more than 30Gb of pictures and information collected from Jupiter and it's moons. This proved to be a good occasion to test all instruments aboard New Horizons.
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photo: NASA, New Horizons Spacecraft, Jupiter's moon, Io, with a volcanic plume