The term ‘cosmology’ refers to the study of the origin, evolution and eventual fate of the universe. Scientists who are interested in this discipline are known as astronomers or physicists; however, also philosophers such as metaphysicians philosophers of the space and time, and philosophers of physics focus on this topic.
The theories related to cosmology include both scientific and non-scientific propositions and can be based on assumptions which cannot be tested. Cosmology is different from astronomy, which is the science which focuses on only on the individual celestial objects.
In modern time, cosmology is dominated by the Big Bang theory, which tries to combine observational astronomy with particle physics.
The Universe consists of all of space and time, including all contents such as planets, galaxies, stars and the other forms of matter and energy. Nowadays, the spatial size of the Universe is still unknown; nevertheless, it is possible to measure the observable universe.
The Universe is predominantly composed of dark energy, dark matter ad ordinary matter. As well as this, its other elements are electromagnetic radiation and antimatter.
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