PROFILEMoon of Jupiter
An ancient landscape
Asteroids and comets have left marks over immense stretches of time. Many remain visible, making Callisto a record of impacts in the Jupiter system.
Beyond the surface
Observations and models suggest a possible subsurface ocean, a question that calls for further measurements.
FACTS TO EXPLORE
ORBITAL PERIODabout 16.7 days
LOCATIONMoon of Jupiter
Values are rounded. AU means astronomical unit. NASA source ↗
