What would cause a theory to be accepted?

A theory is typically accepted when it is supported by substantial empirical evidence, demonstrates consistency with existing knowledge, and effectively explains and predicts phenomena within its scope. Peer review and replication of results by the scientific community also play crucial roles in validating a theory. Additionally, the theory must be falsifiable, allowing for the possibility of being disproven through further experimentation. Over time, as more data aligns with the theory and it withstands rigorous scrutiny, it gains wider acceptance.