I have never heard anyone define philosophy the way you did. It is not the job of the philosopher to postulate scientific theories, it is the job of the scientists to both do that and test them -- thus the distinction between theoretical and experimental scientists in some theories (especially physics). Physics theories are generally born in the minds of theoretical physicists, not philosophers. In regards to science, philosophy concerns itself with metaphysics, ontologies, etc., defining what science is, how its methods can be rationally justified, and just what scientific results actually mean. Doing the science is left to the scientists.
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