I must offer my usual disclaimer – I am not a scientist, so I don’t really know.

There seem to be two ways of looking at gravity. G R says it is not a force, it is a distortion of spacetime. Q T says it is a force, mediated by a theoretical particle, the graviton. Yer pays yer money an’ yer takes yer choice.

Then there are questions like: If it’s a force, what is its origin, and why does it seem to be inexhaustible? The following is a product of some of my thoughts on the subject.

Given a situation in which an enormous mass, such as the total mass of the Universe, is compressed into an unthinkably small “speck”, with a diameter no greater than the Planck distance, we might just be forgiven for referring to the resulting curvature of spacetime as “infinite”. This, we are told, approximates to the state of the Universe at the instant of the Big Bang. If this is the case, it follows that every particle of matter and energy in the Universe, at the start of its life – or of this cycle of its life – occupied the same point in spacetime. The energy, whatever its source, that caused this infinitesimal, primordial speck to expand, transforming itself into billions of light years of spacetime would also have caused the curvature of spacetime to expand, and to “soften”, but, it would always remain curved, thus it would always tend to return to its original condition, like a rock falling back to Earth when it has been picked up and dropped. This would mean that the energy which drives gravitational attraction is the potential energy imparted to every particle in the Universe by the Big Bang. Thus, there is sufficient potential energy within the Universe to bring every particle back to an infinitesimally small speck. In this scenario every particle in the Universe contains enough potential energy to bring it back into contact with every other particle.

Just a thought.