Close-up of the craters and furrows on Ganymede's surface. Credit: NASA/JPL-Caltech/SwRI Aside from being the biggest of Jupiter's 95 moons, Ganymede is best known for its axial tilt and deep ...

If the moon Europa is tilted on its axis even slightly as it orbits the giant planet Jupiter, ... Previous theoretical calculations expected Europa to have an axial tilt of at least 0.1 degrees.