We all know that gravity is the tendency of two objects with non-zero mass to accelerate towards each other, and that the greater mass an object has, the less it accelerates in comparison to other objects. Two Apples in zero gravity will "meet halfway", and the same is true for Earth and a falling object: Earth will move towards the object, but in such a minuscule amount it is virtually undetectable.
So the question is: if everyone on the northern hemisphere of Earth jumped over and over again, how long would it take for a noticeable shift in Earth's position relative to it's original position, (i.e. for Earth to move in our direction enough to be noticeable via observation), considering the massive difference in mass between us and the Earth, and assuming that the Earth is not revolving around the sun, but is isolated from any other celestial body?
Limited Energy is a variable, also what I described earlier as stupid technical sh!t.
You also have the wrong idea of gravity: the Earth is not a special object, it is an object with mass like everything else in the universe. What happens when you jump on a cheap plastic chair? it breaks. It doesn't bounce you back. What happens when you hit a cueball at an 8-ball? They bounce, and..oh look, they MOVE, and change from their original position. Same thing with Earth, in timed order since you don't seem to get it: You jump, now you are in position A. You now move towards the Earth, and the Earth moves towards you. However, the force of gravity is greater than the force of momentum; so when you and the Earth make contact, the momentum reflects, but the Earth made progress, being the object of greater mass, and has a positive net acceleration.
What, you think just because you are a "top contributo