What characteristics make the moon different from all the other natural satellites in the solar system? It is quite large with respect to the mother planet (one third of the diameter of the Earth) with which it really forms a "double astronomical body", influencing the terrestrial orbit. (It stabilizes it: if the Moon did not exist, the Earth would have an elliptical orbit that would probably make life impossible, alternating between too close or too far from the Sun) Other planets have much larger but dwarf satellites compared to the planet (Ganymede, Jupiter's largest moon, is only 6% of the planet's diameter), so their influence is much less. Also its origin: while all the other satellites were once planets or even asteroids captured by the largest planet, the Moon was created after a collision between the original Earth (different from the one we know today) and some other celestial body that has disappeared today. (ie, it became part of the Moon and part of the Earth). And already out of science, beauty. You're not going to compare this... ... with this (the satellites of Mars, true debris of space)
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