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Found a way to measure size of the earth by using the sun. If we can now measure the Earth then were able to measure the other planets in the solar system.
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He set up the model that the sun, stars, and planets revolved around earth. It ended up being wrong but it helped to find that this was the knowledge of Grecian astronomy
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Formed the base model of solar system, even know it wasn't entirely correct, he set the platform for the other scientist.
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Proved the Earth centered the solar system not the sun, which helped also prove some of Kepler laws.
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Discover the three laws of planetary motion.These discovers shifted our thoughts on the universe as we knew it.
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Formed the basic laws of motion, which are the basics for mechanics. These laws also explained why Kepler laws of planetary motion are true.
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Albert had many discoveries about the universe and time as we know it. But perhaps his best discovery was the theory of relativity. That theory the evolution of atomic power, which helped form atomic bombs.