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, ...

Small, icy moons might be boiling under their surface. Many moons in the outer solar system are thought to harbor subsurface oceans beneath their icy crusts. New computer simulations, reported ...

For a long time, people imagined the moon as a quiet, frozen world where nothing much happens anymore. But new research shows that the moon is more active than we once thought. Scientists have created ...