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Universe
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Universe is defined as the totality of everything that exists. It Includes all physical matters, the energy, plants, the stars, the galaxies and the content of intergalactic space.



Universe is extremely large and possibly infinite in volume. Observable matter in space is spread over a space at least 92 billion light years across. The diameter of a typical galaxy is 30,000 light years and typical distance between two neighboring galaxies is 3 million light years. Our galaxy Andromeda is 2.5 million light years away. There are more than 100 billion galaxies in the observable universe. Observable matter in the universe is spread isotropically, meaning that no direction of observation seems different from any other. The present overall density of the universe is very low. Roughly 9.9*10 -30 grams per cubic centimeter.
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