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From the Large-Scale Universe to the Milky Way

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Cosmology is the study of the universe, everything from the largest galaxies to the smallest atom. It attempts to answer the question, “How does the universe work?”, by looking at everything in the universe and working to understand it. Cosmology has always been studied, however in the last 20 years, technology has given scientists new information and allowed for an increasing knowledge of the structure and history of the universe with the ultimate goal of finding a theory that can explain everything. The Copernican Revolution was the beginning of modern cosmology. It was the time when the geocentric model of the solar system was disproved, opening up the possibilities that explained the universe. Newton’s Laws provided another piece of the cosmology puzzle and gave today’s scientists the laws they must work with to explain the universe. Albert Einstein provided yet another theory the universe must operate on, giving scientists even more boundaries for whatever discoveries they make. With the modern addition of advanced telescopes, today’s scientists are able to explain the vastness of the universe, as well as how galaxies, stars, planets, and all the other matter that makes up the universe. The Big Bang theory explains how the universe came to be. Before the Big Bang, there was nothing. After, there was something. 14 billion years ago, a massive expansion began, creating all the matter necessary for the universe to exist today. It was an extremely dense, hot, tiny
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