Just hit me now, and maybe I'm way past my bedtime, but I always thought the rotation creates the gravity on planets. But the moon does not spin/turn. So how does the astronauts stay on the moon (if they were ever there)?
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Mass generates gravity, are you confusing rotation with the centripetal force "artificial gravity" shown in sci-fi? The Moon does rotate, it is tidally-locked with the Earth so it rotates just fast enough as it orbits that the same side faces the Earth. Venus has similar gravity to the Earth being almost the same size even though it spins so slow that it's day is slightly longer than it's year.