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[Ashe]

Basically yeah. Gravity is a theory, in the scientific sense, because it has yet to be disproven by any tests. That said, the distortion of time space accomplishing the same thing as gravity is something that hasn't really been disproven yet either. All tests currently support both of those. This is what a scientific theory (and science) is all about - asking questions and frequently retesting those answers to see if they still hold up and looking at them again.