BBC Horizon TV - Solar Empire TV - The Universe TV -
Ganymede has a composite surface. About half of it is densely cratered like Callisto’s and is therefore very old. But some parts of Ganymede have many fewer craters. Horizon: Earth to Miranda, BBC 1990
Galileo goes on to Ganymede. At three thousand miles in diameter this is the largest moon in the solar system. It’s a mixture of ice and rock. Galileo made a number of passes. Solar Empire: Edge of Darkness, Discovery 1997
Jupiter’s largest moon ... Larger than the planet Mercury its gravity is closer to that of Earth’s than any other of Jupiter’s other moons ... Ganymede is the only moon in the solar system with its own magnetic field. The Universe s2e5: Alien Moons, History 2008