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Every object in the universe attracts every object. The degree of attraction depends on the mass of the object and the distance between them.

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Tycho Brahe's Assistant that continued his work. He was a brilliant mathematician and after studying Brahe's data he concluded that certain mathematical laws govern planatery motion.

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A Greek astronomer that expanded the geocentric theory in the second century. Also known as the Ptolemaic System.

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A Polish ceric and astronomer studied the planetary movements for more than 25 years. His data showed that the Sun was at the center of the universe, he created a heliocentric view of the universe. But he knew the church wouldn't agree with his finding so he kept his work unpublished until he was on his deathbed.

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A logical procedure for gathering and testing ideas. First, it starts with a question from an observation, than turns into a hypothesis. The hypothesis is then tested in an expirement. And finally its analyzed and interpret data to reach a new conclusion.

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A great english scientist who studied mathematics and physics at Cambridge University. He discovered that the same force ruled the motion of the planets and all matter on Earth and in space, gravity. That everything was linked to the universal law of gravitation.

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An Italian scientist who made his own telescope to study the planets and stars. His findings clearly supported Copernicus's theory of a heliocentric view of the universe. The Church threatened Galileo until he agreed that the ideas of Copernicus were false. But he was sentenced to house arrest for the rest of his life.

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Scholars replaced old assumptions with new theories. The scientific revolution was a new way of thing about the natural world, It was based upon "careful observation and a willingness to question accepted beliefs."

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The theory which puts the sun in the center of the universe with the planets revolving around the sun. Being the fixed celstial body that gives light to the surrounding planets.

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The theory which puts Earth at the center of the universe. And the celestial bodies move on spheres revolving around the Earth, the Moon being the most inner followed by the planets and the fixed stars on the outside.