Ganymede is the largest of the Galilean moons orbiting Jupiter. Galileo recorded seeing the moon in 1610. The moon is named for the cup bearer of Zeus.
I took Astronomy in college because someone suggested I take it. He said later that he thought I would fail. But how I got there doesn't matter because I loved Astronomy, got an A, and took the next level with the sky observations.
More about Ganymede:
http://solarsystem.nasa.gov/planets/ganymede/indepth
http://www.nasa.gov/press/2015/march/nasa-s-hubble-observations-suggest-underground-ocean-on-jupiters-largest-moon
http://www.theverge.com/2015/3/12/8199689/jupiter-moon-ganymede-hidden-ocean-water
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