The first moon, Io, is the closest to Jupiter of the Jovian moons, however, it is Jupiter’s fifth closest moon orbiting at roughly 262,000mi. Though it is slightly larger than our own moon, for Jupiter is it only the third largest. Ganymede, Io, and Europa are in orbital resonance with Jupiter, and this causes their orbits to become elliptical. Io’s orbit takes it through Jupiter’s magnetic lines of force causing it to generate electrical currents. These currents travel along Jupiter’s magnetic field lines to the planet’s surface and creates lightning in its upper atmosphere Io is known for having incredibly high volcanic activity. Its plumes can reach heights of up to 190mi. Io’s volcanoes give it a very thin sulfuric atmosphere, but this
