Although a theory is often trusted and reputable, theories must be constantly tested and revised. Gravity is a law because it applies in every situation in the same way (but perhaps in different quantities).
Theories and Laws
- A scientific theory is a strongly supported hypothesis with no significant evidence to disprove it.
- If conflicting data is discovered, theories can be revised or discarded.
- A law is something that always applies the same way, regardless of the conditions.
- Laws explain simpler things than theories: laws state that things happen, but theories explain why they occur.
Theories are very comprehensive, and thus scientists spend
a lot of time trying to reinforce and develop their theories.