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There are two planets in our solar system that do not have moons: Mercury and Venus. They are the two planets closest to the sun and they are both terrestrial planets like Earth and Mars. Their proximity to the sun may be part of the answer; the sun's gravity may disrupt the orbits of would-be moons. This could especially be true of Mercury, which is the innermost and least massive of the planets. It is also possible that the planets simply never experienced events that would result in a moon with a stable orbit. Venus has the slowest rotation of all the planets and actually rotates "backwards." This slow retrograde rotation would tend to drag any orbiting moon in through tidal interactions, so it is possible than Venus once had a moon or moons that crashed int the planet long ago.

We do not know how many planets outside the solar system have moons.

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8y ago

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