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Ptolemy thought that the earth was the in the center of the solar system and all the other planets revolved around it.
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Nicholas Copernicus thought that the sun was at rest and he assumed the earth had to be in motion. Also that the remaining planets fell into the ssame ordely orbit
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Johannes Kepler discovered that the orbits of the planets are ellipse and the sun is in the center of it.
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Galileo Galilei explained that to see the sky through the telescope you had to look up. He also thought the Earth was a sphere and he improved the telescope.
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Sir Isaac Newton explained that the center of mass of a body either reamins in rest or movesin the same speed in a straight line.
