Maimonides on the Science of the Mishneh Torah: Provisional or Permanent?

What was Maimonides' attitude toward the typically medieval description of the universe presented at the beginning of his great law code, the Mishneh Torah? Was that account of the physical universe meant only as a statement of the best description of nature available at the time (and thus radically distinct from the halakhic matters which make up the bulk of the Mishneh Torah), or was it meant to be a description of the true nature of the universe as it really is, not subject to revision in the light of new paradigms or new models (and thus essentially similar to the halakhic matters in the text)?