Ganymede is the largest satellite in Jupiter and the largest in our solar system. If Ganymede orbits the sun instead of Jupiter, it could be classified as a planet. In this image its diameter is compared with that of other bodies of the Solar System, among which are two planets, Mercury and Pluto.
Some planetary systems reproduce the structure of small solar systems, particularly those of the major planets that are usually some sizeable satellites. The exceptions are two: our moon, too big for Earth, and Charon, Pluto's satellite.
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