Geologic Map of Io of the Day

The U.S. Geologic Survey has released the first-ever complete geologic map of Jupiter's moon Io, created using images from Voyager fly-bys and the Galileo Jupiter mission.

The high-resolution map reveals that Io's rapidly churning surface (which renews itself at a rate of 1 cm/yr) and active volcanism have prevented impact craters from forming on the planet, making it the only known object in the solar system