Observations using the Hubble telescope have provided the best evidence yet that Jupiter's Ganymede, the largest moon in the Solar System, has a huge, salty, water ocean under its icy crust. There may be more water on Ganymede than there is on the surface of Earth.
Hubble is likely best known for its deep sky work, but it has also made numerous discoveries within the Solar System.
Friday, March 13, 2015
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