flippant summary of bayesian stats: normalize the likelihood, multiply by a prior (which you can just set to whatevs).
oh, and you are allowed to assign probabilities to non-repeatable events, i.e. what's the probability there is life on mars?
oh, and you are allowed to assign probabilities to non-repeatable events, i.e. what's the probability there is life on mars?
I get the impression that believers in the Bayesian Revolution often also subscribe to the many worlds quantum interpretation, which would make P(life on Mars) a repeatable event.