When considering the Galilean moons of Jupiter and the relative crater impacts on their surfaces, Ganymede and Europa have ice covered surfaces; Ganymede with an ocean just below the surface, Europa likewise covered in an icy crust. Io constantly ... read more
Callisto is the most distant from Jupiter, experiences less gravitational pull on its form as it rotates on its axis and revolves around Jupiter so it’s surface is more ancient and the impact craters are better preserved. read more