In science a law is a **description** of an observed phenomenon. Often this takes the form of a mathematical equation describing the relationship between observed phenomenon.
A theory in contrast is an **explanation** of why a phenomenon exists or what causes it. They run the range of completely untested guesses to enormously supported explanations accepted by basically everyone as correct; there is no “graduation” from one thing to another via consensus or evidential support, a theory is always a theory no matter how well or little it is accepted.
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