Robert.Evans
You will be assimilated; it is His Will.
Sure.Theories are practical or theoretical. A theoretical theory is one in which it's prediction have not been tested, fully or partial. So in the case of the Big Crunch this can not be tested outside of a computer simulation. Theoretical theories can be discarded or modified as new date or tests are done. A practical theory is one which has been tested fully. Many theories in physics are theoretical since we can only use mathematical models in computer simulations to test the idea. At time this is due to time limited depending on the theory. For example our theories on star formation and star evolution are restricted by the time it takes for stars to go through this process. We can not observe a star for 5 billion years to prove the theory's predication. So instead the mathematically model is inputted into a computer system and ran. If the math is correct the model will produce a result. If the math is wrong the result will fail. Theoretical theories still have evidence is support just the prediction can not be tested is the same manner as in person real-time experiments.