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★ Ganymede

Ganymede: see Jupiter & Solar System & Space & Universe & Moons & Astronomy & Moons & Exploration

BBC Horizon - Solar Empire TV - The Universe TV -

 

 

74,273.  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

 

 

74,274.  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

 

 

74,275.  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: Alien Moons