NASA’s New Horizons spacecraft flew by Jupiter in March on its way to a 2015 rendezvous with Pluto and snapped this spectacular photo on March 2, 2007.
You are looking at two of Jupiter’s moons, Io on the left, and Europa on the right.
Take a closer look at Io—that blue cone on top is an erupting volcano called Tvashtar and the plume extends nearly 200 miles. In fact, if you look really close, you can see two other smaller volcanoes erupting to the lower left of Tvashtar.
Io is the most volcanically active body in the entire solar system.
Read more: http://www.nasa.gov/mission_pages/newhorizons/main/index.html
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