The cosmos is the universe considered as

an integrated orderly system. Sometimes the cosmos

is the orderly part of a larger whole, the

other part being chaos. Any account of the origin

of the universe as a whole, whether based on

myth, religion, philosophy, or science is a cosmogony.

An account of the nature and origin of

the universe that is systematic is a cosmology. This

term is used for the particular branch of physics

that considers this question, and also for inquiries

of a more philosophical nature. Cosmological arguments

for the existence of God begin with very

general facts about the known universe, such as

causation, movement, and contingency, and then

argue that God must exist, as first cause, or unmoved

mover, or necessary being, to account for

these facts. The first two ways of proving the existence

of God listed by St. Thomas Aquinas are

cosmological arguments.