The term 'cosmos' is used to refer to the UNIVERSE as a whole, and can be broken down into four distinct parts. The first is MACROCOSM, which refers to the large-scale structure of the UNIVERSE, such as galaxies, stars, and planets. The second is CREATION, which refers to the origin of the UNIVERSE and its contents. The third is UNIVERSE, which is the entirety of space and time, including all matter and energy. Finally, ETHER is an archaic term for the medium that was believed to fill the UNIVERSE and transmit light. Together, these four terms form the concept of cosmos, which is the totality of the UNIVERSE.