This kind of event, known as true polar wander, is rare—and impressive. Ganymede, like Earth’s moon, is tidally locked, which ...

For instance, Ganymede's dramatic reorientation may have ... JUICE pulled off difficult gravitational slingshots past our ...

which can be determined to a high degree of accuracy from its motion away from or toward Earth and measured by examining radio communications. The temporal deformation of Ganymede's surface by Jupiter ...