One valid viewpoint may be It doesn't matter. The only thing there is is the effect of gravity. Whether you explain it one way or another way doesn't matter. Wh

One valid viewpoint may be It doesn't matter. The only thing there is is the effect of gravity. Whether you explain it one way or another way doesn't matter. What matters is the result. Two theories that predict exactly the same things in different ways are for all purposes equivalent and indistinguishable. Of course one theory might be easier to use.