About Io

Io is the innermost and second smallest of the four Galilean moons of Jupiter. Slightly larger than Earth's Moon, Io is the fourth-largest natural satellite in the Solar System, has the highest density and strongest surface gravity of any natural satellite, and the lowest amount of water by atomic ratio of any known astronomical object in the Solar System.

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Facts from Wikidata (CC0). Image by NASA / SWRI / MSSS / Jason Perry via Wikimedia Commons (CC BY-SA 3.0).

Io

innermost of the 4 Galilean moons of Jupiter

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Not who you're looking for? Others named Io: nymph seduced by Zeus in Greek mythology · programming language · progenitor and supreme deity of all dragons in Dungeons & Dr · Uninhabited islet in Greece

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About Io

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Facts from Wikidata (CC0). Image by NASA / SWRI / MSSS / Jason Perry via Wikimedia Commons (CC BY-SA 3.0).