What fundamental difference in scientific methodology characterized Einstein compared to Hubble?

Answer

Einstein excelled at the *a priori* while Hubble operated on the *a posteriori*.

Einstein's genius lay in deriving reality from fundamental principles (*a priori*), whereas Hubble's success depended on demanding verifiable, measurable data from space (*a posteriori*).

What fundamental difference in scientific methodology characterized Einstein compared to Hubble?
astronomyAstronomercosmologyPhysicistencounter