According to einstein, mass curves spacetime and objects in the nearby field tends to travel in the shortest possible path to reach their heavier counterparts. My question is was not newton's interpretation better;i.e considering gravity as a force that acts on n masses and tends to attract? I kn...

In all the references/textbooks that I have looked at, the precise definition of spacetime is never really clear. By gathering the hypothesis that we need to make, I get the following definition: $$\text{spacetime is a smooth orientable Lorentzian manifold with or without boundary}.$$ But it seem...