In this contribution I investigate the relation between Peter of Auvergne’s questions on Aristotle’s cosmological work De caelo and the condemnations of 1277. First I give a short survey of Peter’s life and work and of two sets of quaestiones on De caelo that are ascribed to him: the CEK-questions (very likely composed in 1271-1272) and the WP-questions (most probably composed after May 2, 1274). Then I briefly discuss the condemnations of 1277 and their relation to De caelo (the condemnations included some theories defended in De caelo). Finally, I discuss in detail the shifts in doctrine between the CEK- and the WP-questions. I argue that it is most likely that the change in doctrine between the CEK- and WP-questions on the eternity and animation of the heavens and on the possibility of an infinite multitude in act is effected by the condemnations of 1277.