The solar system is home to bizarre moons like Enceladus and Callisto, each unveiling nature’s wonders and some of science’s ...

If there was a contest for the most interesting moon in our solar system, Callisto would be a contender. Jupiter's second-largest moon has more impact craters on its surface than any other ...

Ganymede, Jupiter's largest moon and the solar system's largest, is bigger than Mercury and the dwarf planet Pluto, with a diameter of 5,268 kilometers.

Callisto is the third-largest moon in the entire solar system. It is the outermost of 95 lunar worlds orbiting the gas giant, and a new study suggests it has a several-miles-deep alien ocean on ...

Jupiter is the largest planet in the solar system and has 79 moons. The four largest moons of Jupiter (Io, Europa, Ganymede, and Callisto) can be seen from Earth with just a pair of binoculars.

Saturn surpasses Jupiter with 128 newly discovered moons, becoming the planet with the most moons in our solar system.