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From what I know, science is the study of the observable world, its theories are supported by evidence.

Now GR is a theory, and it informs that mass curves the 'fabric' of space and time. The thing I don't understand is that there is no evidence of mass curving spacetime, then how is GR a theory? If there is evidence, then what is spacetime, really, since it's something which has the potential to be curved?

From what I know, in GR gravity is not a force, it's a curvature of spacetime. If so, force is needed to curve the spacetime, but where is that force in GR?

Thanks...

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# Where does all this spacetime curvature come from?

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