There goes another one. Volcanoes on Jupiter's moon Iow keep erupting. To investigate, NASA's robotic Juno spacecraft has begun a series of visits to this very strange moon. Iow is about the size of Earth's moon, but because of gravitational flexing by Jupiter and other moons, Iow's interior gets heated and its surface has become covered with volcanoes. The featured image is from last week's flyby, passing within 12,000 kilometers above the dangerously active world.