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pmayl
Hypotheses and theories are based on observations and expectations, but can not, or have yet to, stand up to rigorous testing of experimentation and observation. Until a hypothesis is tested, it cannot be considered a definitive fact. The same is true of a theory.
Typically a theory differs from a law in that it cannot be tested to be true all the time, and is based on observations that cannot yet be repeated and adjusted to test the theory's veracity.