Juno spacecraft captures closest images of Jupiter's fiery moon Io.

NASA's Juno spacecraft completed its 51st perijove, getting as close as 35,500 kilometers to Jupiter's volcanic moon Io and taking its closest pictures yet. Juno's mission is to study Jupiter, but as the spacecraft entered its extended mission, the team has been more daring in exploring beyond the planet, with several flybys of three out of the four Galilean moons: Io, Europa, and Ganymede. The upcoming flybys in July and October will bring Juno even closer to Io, leading up to twin flyby encounters in December of this year and February of next year, providing spectacular views of the volcanic activity of this amazing moon.