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300bc Aristotle belived in the geocentric model of the universe. He thought the earth was stationary and the universe revolved around it in perfect circle.
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100ad Ptolmey agreed with Aristotle in the Geocentric model of the universe. People saw flaws in Aristotles model of the universe so he came up with a eplanation for it.
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Nicolaus Copernicus first proposed the heliocentric model of our solar system. This was the planets orbiting the sun, which was in the center of our solar system.
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Galileo Galilei belived in the heliocentric model of the universe. He created the telescope which helped further the investigation of space.
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Isaac Newton belived in the heliocentric model of the universe. He discovered Universal Gravity which is the same Gravity that makes a apple fall on Earth, keeps the planets orbiting the sun.
