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Thought that the earth was in the center of the universe and discovered that the earth is round. A reason why this discovery could be seen as important because it disproves the theory that the earth is flat https://www.famousscientists.org/claudius-ptolemy/
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Established the concept of the Sun being in the center of the universe . A reason why this can be seen as important is by proving that the earth is not the center of the universe https://www.biography.com/scientist/nicolaus-copernicus(https://www.timetoast.com)
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One of many astronomers to believe that the sun is in the center of the universe. This can be seen as an important event because it further proves the theory brought up by Nicolus https://study.com/academy/lesson/tycho-brahe-discoveries-facts-contributions-to-astronomy.html
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Defined laws regarding planetary motion. This can be seen as important because it shows how the planets go in a circular motion https://www.britannica.com/biography/Johannes-Kepler/Keplers-social-world
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Discovered the three laws of motion. This can be seen as important because it helped discovery gravity and proved that a thing at rest will stay at rest, and a thing moving will stay moving https://www.britannica.com/biography/Isaac-Newton
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Discovered his theory of relativity. This can be seen as important because it helps us discover the power of atoms https://www.britannica.com/biography/Albert-Einstein