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Why doesn't Jupiter cause it's moons to crash into it?
atoms are 3d, compare atom with solar system is not correct.
The moons are in free fall, but they are falling in a very special way that we call "orbiting." These moons have very stable orbits, meaning they will stay as they are for a very long time (but not necessarily forever--our own moon is on course to crash into the Earth in several billion years, and one of the Martian moons may crash in less than one billion!) Jupiter may have started out with many moons that it no longer has, and they either crashed into Juptier, or got flung off into space because their orbits got disturbed.