Saturn’s moon Mimas looks like the Death Star, a 400 km wide sphere covered with craters, including one massive impact basin. It appears completely dead. Yet the moon wobbles slightly as it orbits, betraying a secret, liquid water…

Saturn’s moon Mimas looks like the Death Star, a 400 km wide sphere covered with craters, including one massive impact basin. It appears completely dead. Yet the moon wobbles slightly as it orbits, betraying a secret, liquid water…