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 ...

Photos from the Juno probe show a new volcano on Io, a moon of Jupiter. The volcanic complex has developed over the last 27 years, which was noticed during satellite observations. Io is one of the ...

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.