How Old Is Callisto?

Callisto, or Jupiter IV, is the second-largest moon of Jupiter, after Ganymede. It is the third-largest moon in the Solar System after Ganymede and Saturn's largest moon Titan, and the largest object in the Solar System that may not be properly differentiated. Callisto was discovered in 1610 by Galileo Galilei.

How old is Callisto surface?

Surface. Callisto's rocky, icy surface is the oldest and most heavily cratered in our solar system. The surface is about 4 billion years old and it's been pummeled, likely by comets and asteroids.

Is Callisto old?

Calisto MT is an old style, serif typeface designed for the Monotype Corporation foundry in 1986 by Ron Carpenter, a British typographer.