Now, when it is said that all things were made by Him, and that in Him were all things created, both things in heaven and things on earth, there can be no doubt that also those things which are in the firmament, which is called heaven, and in which those luminaries are said to be placed, are included among the number of heavenly things. And secondly, seeing that the course of the discussion has manifestly discovered that all things were made or created, and that among created things there is nothing which may not admit of good and evil, and be capable of either, what are we to think of the following opinion which certain of our friends entertain regarding sun, moon, and stars, viz., that they are unchangeable, and incapable of becoming the opposite of what they are? Not a few have held that view even regarding the holy angels, and certain heretics also regarding souls, which they call spiritual natures. (Book I, Chapter 7, Part 2)

Freedom of choice extends even to the sun, moon, and stars.

In this Origen anticipates the findings of modern chaos theory.

Nothing but God is unchangeable. Good can become evil. But crucially so can evil become good.

For Origen this is primarily a moral argument. He observes the natural world in order to make a case for the human condition.