Gravity does not, in fact, exist. The universe itself exists in a dimension known as spacetime. There are Doppler shifts where gravity is no longer regarded as a thing, but is more like an outcome. Not a force but a biproduct warping spacetime distortion. It would be more than a dimension of space.  Three parts space and one part time. That the universe created us with complex neurology, a brain that is constantly learning how to adapt, we now at long last know we live on a planet that does not want us here.