How does a law differ from a theory?
a law is a theory that has been proven to be true and universal.
a theory is a group of hypotheses that prove a law is true.
a law is a statement of fact, but a theory is an explanation.
a theory is a proposed law that has not yet been peer reviewed.

A law is a statement of fact, but a theory is an explanation.

Explanation:

A law can be based upon the already proposed facts which does not include any kind of verification or testable evidence. But the theory includes the detailed explanation of the facts and is generally based on the testable evidences obtained after application of suitable methodology.

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