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wrote the almagest which is the only surviving ancient complete guide to astronomy.
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1514 heliocentrism, discovered flaws in the geocentric theory and created something that would correct these flaws
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discovered that there was not a dome of stars but it had depth and observed the moons of jupiter, he used a telescope and logic
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rules that govern us on earth govern stars as well, used logic and the newtonian telescope.
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he created the first kind of dynament, did so by absorbing nitroglycerin in other materials to make it more stable.
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he discovered radioactivity. putting radioactive elements into negatives.
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he discoverd that the speed of light is constant, and that the rules of gravity and light also apply in space. he discoverd this by making observations.
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she discovered that cepheid stars put a fixed amount of light, which was used to measure distances. she did so by using her knowledge about variable stars to determine that all of the cepheid stars in a cluster had the same variability
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he made calculations to prove the expansion of the universe, he used the the redshifts he discovered to determine the path of planets.
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hestimated the size of the milky way, found the exact distance to a star, and used it to find the distances to other clustersin our galaxy
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he discoverd that the universe is expanding, he measured distanced to some stars,and repeated the process and they stars were further away
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he established the distance scale of the universe and did so by working with hubble and other scientists.