There are many interesting moons orbiting the planet, but the ones of most scientific interest are the first four moons discovered beyond Earth – the Galilean satellites: Io, Europa, Ganymede, and Callisto. In Depth ›
There are many interesting moons orbiting the planet, but the ones of most scientific interest are the first four moons discovered beyond Earth – the Galilean satellites: Io, Europa, Ganymede, and Callisto. In Depth ›