Saturn's small moon Mimas, nicknamed the "Death Star" for its giant crater, may have a hidden ocean beneath its icy shell, researchers from UC Davis said. A slight wobble in the moon's movement ...

Rather than flowing magma, geological shifts on icy moons are produced by melting ice. The ice shells coating these moons wax ...

Little is known about the long-destroyed moon-forming planet, Theia. But it may have been born in the inner solar system—just like Earth—a new study suggests ...