Concerning cosmology, Anaxagoras, like some Greek philosophers already before him, believed the cosmos was revolving, and had formed into its visible order as a result of such revolving causing a separating and mixing of different types of chemical elements. "Nous", in his system, originally caused this revolving motion to start, but it does not necessarily continue to play a role once the mechanical motion has started. His description was in other words (shockingly for the time) corporeal or mechanical, with the moon made of earth, the sun and stars made of red hot metal (beliefs Socrates was later accused of holding during his trial) and "nous" itself being a physical fine type of matter which also gathered and concentrated with the development of the cosmos. This "nous" (mind) is not incorporeal; it is the thinnest of all things. The distinction between "nous" and other things nevertheless causes his scheme to sometimes be described as a peculiar kind of dualism.