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Unmoved moveror prime moveris a philosophical concept described by Aristotle as a primary cause or “mover” of all the motion in the universe. As is implicit in the name, the “unmoved mover” moves other things, but is not itself moved by any prior action. Aristotle describes the unmoved mover as being perfectly beautiful, indivisible, and contemplating only the perfect contemplation: itself contemplating.   Unmoved movers or prime mover are, themselves, immaterial substance, (separate and individual beings), having neither parts nor magnitude. As such, it would be physically impossible for them to move material objects of any size by pushing, pulling or collision. Because matter is, for Aristotle, a substratum in which a potential to change can be actualized, any and all potentiality must be actualized in a being that is eternal but it must not be still, because continuous activity is essential for all forms of life. This immaterial form of activity must be intellectual in nature and it cannot be contingent upon sensory perception if it is to remain uniform; therefore eternal substance must think only of thinking itself and exist outside the starry sphere, where even the notion of place is undefined for Aristotle. Their influence on lesser beings is purely the result of an “aspiration or desire”, and each aetheric celestial sphere emulates one of the unmoved movers, as best it can, by uniform circular motion. —  Wikipedia.org