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}}'''Io''' is the innermost of the Galilean moons of [[Jupiter]]. It is the most [[volcano| volcanically]] active object in the [[solar system]] and the most dense of all [[planet]]ary satellites. Io was named for an Argive princess and priestess of [[Hera]] who became a fairly prominent mistress of [[Zeus]], after much suffering. That name, assigned quite by accident in the seventeenth century, might be quite apt today in view of Io's volcanic activity and the likely reason for it.

}}'''Io''' is the innermost of the [[Galilean moons]] of [[Jupiter]]. It is the most [[volcano| volcanically]] active object in the [[solar system]] and the most dense of all [[planet]]ary satellites. Io was named for an Argive princess and priestess of [[Hera]] who became a fairly prominent mistress of [[Zeus]], after much suffering. That name, assigned quite by accident in the seventeenth century, might be quite apt today in view of Io's volcanic activity and the likely reason for it.

== Discovery and naming ==

== Discovery and naming ==