Gravitation -- Why don't planets smash into each other? Why don't planets smash into each other? The universal law of gravitation states that everything pulls everything else in the universe. Using this logic shouldn't the Sun move because it should be experiencing the pulling force from so many planets? Using the charge analogy if a positive charge is kept in the vicinity of a negative charge, there is a force on the charges and both of them accelerate towards each other, why doesn't this apply to the planets?