Io (moon)

Innermost of the four Galilean moons of Jupiter

Io (moon) (Under CC License)

Io is the innermost of the four Galilean moons of the planet Jupiter. It is the fourth-largest moon, has the highest density of all the moons, and has the least amount of water of any known astronomical object in the Solar System. It was discovered in 1610 and was named after the mythological character Io, a priestess of Hera who became one of Zeus' lovers.

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The most volcanically active world in the solar system isn’t Earth, believe it or not.
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