Scientific theory

A scientific theory is a scientific hypothesis that has undergone numerous checks that confirm its validity as a theory.

What is needed for a theory?

For a theory to exist, it must start as a hypothesis, go through vigorous testing and re-testing, and remain true throughout the testing. If the hypothesis remains true, then it can be identified as a theory. If it does not, the scientist must return to his hypothesis to alter it or completely start over.

Alternate usage

Scientists also speak about tentative theories that may have had little or no testing. For them, a theory is just a connected set of hypotheses that is worthy of scientific consideration. For example, they may discuss String Theory or a theory of extraterrestial intelligence, even though these theories have no supporting evidence.^{[Citation Needed]}