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He thought that the Earth was at the center of the universe and that the other planets an the sun revolved around the Earth
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He used large tools, such as a mural quadrant, to make detailed astronomical observations and to measure the positions of stars and planets
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He proved that the sun is at the center of the universe
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Kepler was Brahe's assisstant and carried on his work. He stated 3 laws of planetart motion
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One of the first to use a telescope. Discovered craters and mountains on the Earth's moon, four of Jupiter's moons, sunspots on the sun, and the phases of Venus.
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Created the laws o gravity and helped us better understand the observations of the earlier scientists
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He proved that other galaxies existed beyond the edge of the Milky Way.
