Version A of the Callisto installment of our solar system poster series. Callisto is a moon of Jupiter.
The posters are best printed on 11x17 paper. Several download options are available in the column on the right.
About the image: Bright scars on a darker surface testify to a long history of impacts on Jupiter's moon Callisto in this image from NASA's Galileo spacecraft. Credit: NASA/JPL/DLR
On the Back
Callisto is the third largest moon in our solar system and is almost the size of Mercury. It is the outermost of the four large Galilean satellites. Callisto is the most heavily cratered object in our solar system. It is thought to be a long-dead world, with hardly any geologic activity on its surface — with a surface age of about 4 billion years, Callisto has the oldest landscape in the solar system. Like Ganymede and Europa, Callisto also shows strong evidence of an ocean deep under its icy surface.
Callisto is named for a woman turned into a bear by Zeus in Greek mythology – Jupiter to the Romans.
Explore Callisto in depth at https://solarsystem.nasa.gov/callisto