Io Image

Jupiter's moon Io is very far from the Sun. The temperatures on Io are cold except for the places near the volcanoes. At the volcanoes, the surface temperature can be as hot as 1704 degrees Celsius! This temperature is hotter than the surface temperature of Mercury. Mercury is the planet closest to the Sun.

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The StarChild site is a service of the High Energy Astrophysics Science Archive Research Center (HEASARC), Dr. Alan Smale (Director), within the Astrophysics Science Division (ASD) at NASA/ GSFC.

StarChild Authors: The StarChild Team
StarChild Graphics & Music: Acknowledgments
StarChild Project Leader: Dr. Laura A. Whitlock
Curator: J.D. Myers
Responsible NASA Official: Phil Newman