Io

Scientific overview

Io is a moon orbiting Jupiter.

Physical characteristics

Sources

Facts on this topic will be cited from these primary and reference sources.

• NASANational Aeronautics and Space Administration

  Mission data, planetary science, space telescopes, and public-domain imagery.

  Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.

• NASA JPLJet Propulsion Laboratory / Solar System Dynamics

  Orbital data, ephemerides, and small-body parameters for planets, asteroids, and comets.