The Interval Between the Earth and the Stars

It is altogether childish to suppose that the moving bodies are all of them of a small size, because they seem so to us, looking at them from the earth. If the intervals were full of fire into the bodies consisted of fire, every one of the other elements would long ago have vanished. Or even if there were two elements to fill the space between the earth and the heavens, the air would far exceed the quantity required to maintain its proper proportion to the other elements. So it is clear that neither air nor fire alone fills the intermediate space. And remains, to explain after a preliminary discussion of difficulties the relation of the two elements, air and fire, to the position of the first element