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Universe Summary.
What is universe
The universe is the totality of all matter, energy, and space that exists. It includes all galaxies, stars, planets, asteroids, comets, and other celestial objects, as well as the interstellar and intergalactic medium that fills the spaces between them. The universe is believed to have begun with the Big Bang, a massive explosion that occurred around 13.8 billion years ago, and has been expanding ever since. The study of the universe is known as cosmology, and it involves the use of astronomy, physics, and other sciences to understand the origins, evolution, and structure of the cosmos.
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