The Universe is composed of a mixture of matter and energy. These interplay with each other via four, or possibly five, types of force to produce the enormous variety of physical properties and phenomena that exists. All but one of these forces dominates the behaviour of matter at short-range. The force of gravity is the one exception. In terms of magnitude, gravitation is by far the weakest of these natural forces and yet, because of its range of influence, it has shaped our Universe, on the large scale, into its present form.
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