Question

What mist models and theories do in oder to remain valid? (2 facts)

Answer 1

Must*
1) There must not be credible contrary evidence to the ideas suggested by the theory.
2) The models and theories must obey the already established laws of physics. Laws are theories which have such an overwhelming amount of evidence that they are "universal", and cannot be disproven. [Rarely]

Answer 2

Hope that helped you. If you liked the answer, go ahead and click the medal button.

Answer 3

I need help with one more question.