The surface of Jupiter's moon Calisto is scarred with impact craters.

The surface of Jupiter’s moon Calisto is scarred by impact craters, and its atmosphere contains carbon dioxide gas.


Astronomers have spotted gaseous carbon dioxide in the atmosphere of Jupiter’s second-largest moon, Callisto, suggesting that its carbon cycle may be more complex than we thought. On Earth, the carbon cycle helps maintain a stable climate.

Callisto is one of the oldest objects in the Solar System, having formed around Jupiter about 4.5 billion years ago. It is one of the most broken items, with a pitted surface.…