You don't observe a theory. You build an experiment which will either confirm or discard (falsify) the theory, and observe its outcome. The theory remains a the

You don't observe a theory. You build an experiment which will either confirm or discard (falsify) the theory, and observe its outcome. The theory remains a theory even in the positive outcome, for it can still be further falsified by other experiments. (and yes it is impossible to build an experiment for string theory so far with energy levels humanity possesses)