  He does, though his response comes only at the end of his treatment of the world’s eternity. The response, found also in Philoponus, is that even to reach the present moment, an actually infinite number of moments must already have elapsed. In other words, there is currently an actually infinite number of moments (or years, or whatever) that have elapsed “since the world began.” And, as Aristotle himself says, the infinite cannot be traversed. Whether this argument is successful is unclear. It seems to presuppose that we select an infinitely distant point in past time, and then reckon the number of years that have elapsed since then. But Aristotle will presumably want to block the initial move of selecting an infinitely distant point in past time, insisting that any particular point we choose in the past will be removed from the present by a merely finite number of years.