W. Feller's volume II proves the renewal theorem from which we can conclude that the stochastic point process of arrivals of asteroids of some size and larger i

W. Feller's volume II proves the renewal theorem from which we can conclude that the stochastic point process of arrivals of asteroids of some size and larger is a Poisson process, e.g., as in Cinlar's book. Then empirical historical data provides a good estimator of the arrival rate parameter of the Poisson process. Net, we can know the arrival rate of dangerous asteroids, and, ballpark, it's one each some millions of years. So, we get to f'get about the problem.