The cosmos is the Universe. Using the word cosmos rather than the word universe implies viewing the universe as a complex and orderly system or entity; the opposite of chaos.[1] The cosmos, and our understanding of the reasons for its existence and significance, are studied in cosmology – a very broad discipline covering any scientific, religious, or philosophical contemplation of the cosmos and its nature, or reasons for existing.
The universe is composed mostly of empty space. But this space is occasionally populated by an amazing assortment of incredible objects. These objects create an orderly, harmonious system known as the cosmos. Close to home, our solar system consists of planets, moons, asteroids, and comets that circle a central star in an orbital dance that has been going on for billions of years. As we move farther away into deep space, we encounter exotic objects with bizarre properties. Pulsars and Quasars shine with the energy of millions of stars. Neutron stars and black holes distort the very reality of space time itself, and somewhere out there, a mysterious substance known as dark matter composes as much as 90% of the unknown universe.
The universe is composed mostly of empty space. But this space is occasionally populated by an amazing assortment of incredible objects. These objects create an orderly, harmonious system known as the cosmos. Close to home, our solar system consists of planets, moons, asteroids, and comets that circle a central star in an orbital dance that has been going on for billions of years. As we move farther away into deep space, we encounter exotic objects with bizarre properties. Pulsars and Quasars shine with the energy of millions of stars. Neutron stars and black holes distort the very reality of space time itself, and somewhere out there, a mysterious substance known as dark matter composes as much as 90% of the unknown universe.
Cosmology:
Cosmology is the study of cosmos, and in a broadest sense covers a variety of different approaches: scientific, religious and philosophical. All cosmologies have in common an attempt to understand the implicit order within the whole of being. In this way, most religions and philosophical systems have a cosmology.
Physical cosmology
Physical cosmology (often simply described as 'cosmology') is the scientific study of the universe, from the beginning of its physical existence. It includes speculative concepts such as a multiverse, when these are being discussed. In physical cosmology, the term cosmos is often used in a technical way, referring to a particular spacetime continuum within a (postulated) multiverse. Our particular cosmos, the observable universe, is generally capitalized as the Cosmos.
In physical cosmology, the uncapitalized term cosmic signifies a subject with a relationship to the universe, such as 'cosmic time' (time since the Big Bang), 'cosmic rays' (high energy particles or radiation detected from space), and 'cosmic microwave background' (microwave radiation detectable from all directions in space).
Philosophical cosmology
Cosmology is a branch of metaphysics that deals with the nature of the universe, a theory or doctrine describing the natural order of the universe. The basic definition of Cosmology is the science of the origin and development of the universe. In modern astronomy the Big Bang theory is the dominant postulation.
Religious cosmology
In theology, the cosmos is the created heavenly bodies (sun, moon, planets, and fixed stars). In Christian theology, the word is also used synonymously with aion to refer to "worldly life" or "this world" or "this age" as opposed to the afterlife or world to come.
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