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Theoretical physics is often based on zero studies (directly), yet ends up in the discipline's core textbooks. Thousands and thousands of examples. Eg the Higgs Boson and gravity waves and BEC were in textbooks for decades before confirmation.
Of course, it's understood that those results _are_ still theory. But then a single study may sometimes be enough to regard a result as most likely confirmed. Eg LIGO and gravitational waves.
