A bit larger than our Moon, Io is the innermost of Jupiter’s four large moons. As it circles Jupiter, Io is gravitationally perturbed by its three sister moons, first being pushed slightly closer to ...

Among its 90-plus satellites, one stands out for its extraordinary geological activity: Io. As the BBC's recent video ...

Along with the stunning detail in its swirling clouds and colorful bands, the school bus-sized probe's JunoCam also focused its lens on Jupiter's moon, Io, the most volcanic world in the solar system.