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42 Four groups of moons orbit Jupiter. The first two groups each have four moons so look very like a model of the whole solar system four small inner bodies followed by four giants. The second group, of four particularly large moons, the Galileans, is further divided into two small rocky worlds, Io and Europa, then two gas and ice moons the size of planets, Ganymede and Callisto. The grouping into fours is very striking indeed. Each of the four groups has its own general moonsize, orbital plane, period and distance from Jupiter the inclinations of the four orbital planes of the four groups even add up to a quarter of a circle 99.9. Saturn has over thirty moons, most shepherding and tuning the amazing rings with the larger bodies tending to be further out. Far beyond Saturns rings, however, are three moons the gigantic Titan, tiny Hyperion and, further out still, Iapetus. Opposite we see fascinating harmonic patterns two from Jupiters largest moons, two experienced by Saturns giant moon Titan and two experienced by Neptune, the outer sizeable planet of the solar system. Disharmony would not make pretty pictures. outer moons harmonic patterns The Moon Europa Callisto Pluto Mercury Io Ganymede Titan Europa Io Europa Ganymede Titan Iapetus Titan Hyperion Uranus Neptune Neptune Pluto
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