I understand your other points but I'm not really sure what you mean by this. Earth is already under the gravitational influence of other orbiting bodies, they just don't cause the Earth to accelerate due to their gravity, except for the Sun of course. It's called Newtons Law of Universal Gravitation. So are you saying that if the moon was gone, the Earth would be at the mercy of the gravitational forces of other planets? The equation for gravitational attraction between two bodies is F=G(M1M2/r^2) and G, the gravitational constant doesn't change, it stays at 6.67e-11 newtons-meters squared per kilogram squared. Meaning for the loss of the moon to affect the gravitational pull between planets, there would have to be an increase in mass or a decrease in distances between the two objects, so I'm wondering what made you think it would take the loss of the moon for the Earth to experience gravitational influence from other bodies? Gravitational force is not necessarily the same thing as acceleration due to gravity. For another planet to break Earth from the centripetal force of its orbit around the sun, that planet would have to have incredible mass as well as a decrease in the distance, and the the presence or lack of a moon can not affect this.Originally Posted by Rich46yo



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