The 4 Galilean moons from left to right: Io, Europa, Ganymede and Callisto. (Image credit: NASA/JPL/DLR) The next day, Galileo looked again and saw the 3 stars were not where he believed they d be. Still not sufficient space?
The 4 Galilean moons from left to right: Io, Europa, Ganymede and Callisto. (Image credit: NASA/JPL/DLR) The next day, Galileo looked again and saw the 3 stars were not where he believed they d be. Still not sufficient space?
