Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. NASA's Cassini spacecraft's ...

Saturn's moons Mimas (right) and Janus appear to hang silently in space as they orbit their ringed parent planet in this stunning photo from NASA's Cassini spacecraft at Saturn. The outer edge of ...

Saturn’s “Death Star”-like moon Mimas may have a boiling ocean under its icy shell. The moon pitted with craters—including a very large one, giving it its nickname—may appear to be geologically dead, ...

Far from the warmth of the Sun, some of the coldest-looking worlds in the solar system may be hiding the hottest surprises. New modeling work suggests that several icy moons of Saturn and Uranus could ...