Notice above that each of the planets in our solar system have varying fields of gravity. It is that variation in gravitational pull, combined with the mass and size of each planet, that keeps each planet within its individual elliptical orbit.
No it isn't. If you don't know any physics, then this forum is a bad place to try making it up and bluffing, as many people round here are quite knowledgeable in this field.
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Let's explain what does actually happen. I'll use Newtonian dynamics, since that's quite sufficient.
The attractive force between two bodies of masses m
1 and m
2 is given by F = Gm
1m
2/r
2, where r is the distance between them and G is a constant.
Now, according to Newton's second law, F = ma, or, rearranging, a = F/m: the acceleration of a body is the force acting on it divided by its mass.
So putting these two formulas together, the acceleration of the body with mass m
1 will be given by a = Gm
1m
2/r
2m
1. The m
1s on the top and the bottom of the right-hand side of this equation cancel, giving us:
a = Gm
2/r
2
So the mass m1 is irrelevant to the motion of the body with mass m1.
This is, or course, why Galileo was right: if the force of air friction is negligible, a light and a heavy body dropped at the same time from the same place will undergo the same acceleration.
It also means that the motion of a body in orbit will be determined by its position, its velocity, and the mass of the body it's orbiting. Its own mass doesn't come into it.
Edited by Dr Adequate, : No reason given.