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CLAUDIUS PTOLEMY
wrote the almagest which is the only surviving ancient complete guide to astronomy. -
Oct 11, 1514
NICOLAUS COPERNICUS
1514 heliocentrism, discovered flaws in the geocentric theory and created something that would correct these flaws -
GALILEO GALILEI
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 -
ISAAC NEWTON
rules that govern us on earth govern stars as well, used logic and the newtonian telescope. -
alfred nobel
he created the first kind of dynament, did so by absorbing nitroglycerin in other materials to make it more stable. -
Alexander Flemming
he discovered radioactivity. putting radioactive elements into negatives. -
Albert Einstein
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. -
Henrietta Swan Leavitt
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 -
Vesto Silpher
he made calculations to prove the expansion of the universe, he used the the redshifts he discovered to determine the path of planets. -
Harlow Shapely
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 -
Edwin Hubble
he discoverd that the universe is expanding, he measured distanced to some stars,and repeated the process and they stars were further away -
Milton Humason
he established the distance scale of the universe and did so by working with hubble and other scientists.