NASA's Juno spacecraft made a close flyby of Jupiter moon lo. See an animation of the images the probe captured created by ...

Observations made of Jupiter’s moon Io during the Juno mission’s flybys helped astronomers confirm how and why Io became the most volcanic world in the solar system.

Four tiny specks of light close by the giant planet are the biggest of the Jupiter’s 95 moons. If we weren’t dazzled by Jupiter’s own glare, these moons are bright enough to be seen by the ...