(Just to clarify, I am not suggesting I know what causes gravity, nor do I have any evidence for my claim, as I just came up with it.)
When you grab a ball, and let go of it, gravity pulls it down due to the energy you gave to the ball, right? Using this logic since everything in the universe is effected by gravity, there must have been something that pulled everything away from everything. Since the Big Bang theorises everything comes from a point, and was pushed away from that point, that would suggest the pushing of the Big Bang provided the energy for gravity.
I don’t know if this has already been theorised, or how this plays with dark energy, but I’m coming up with this as I’m writing this.
