An Ocean on Ganymede

I Read Encyclopedias for Fun

It seems that after I posted about possible life-bearing worlds in our solar system, all these announcements have come out.  Well, now it’s Ganymede’s turn.  Not on my top five list, it may need to be included, though looking at the structure of Ganymede, it’s still a low possibility.

Ganymede_g1_true_2Ganymede is the largest natural satellite in the solar system, even larger than the planet Mercury, but it doesn’t contain as much mass.  The reason is that Mercury has a huge iron core, while Ganymede’s is smaller.  It’s also not common for a moon to have an iron core, and it and Europa are the only two icy moons to be lucky enough.  Ganymede’s molten iron core gives it the distinction of having its own magnetic field, and even aurora.  And it’s just that particular feature that scientists were looking at with the Hubble Space Telescope.  What it enabled them to…

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