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427 BCE
Plato
An Athenian philosopher who thought Earth was round, but also thought it was the center of the universe. He decided that the cosmos have certain traits, some wrong and some debatable, and also concluded that the cosmos must be related to math in some way. -
Dec 14, 1546
Tycho Brahe
Recorded a supernova and proposed a false "geo-heliocentric" solar system. -
Isaac Newton
Postulated the gravitational law and established his three laws of motion. -
Pierre-Simon Laplace
Postulated the existence of black holes, and the Nebular Hypothesis (how stars are formed in nebula). -
Percival Lowell
Falsely predicted that there was life on mars. -
Georges Lemaitre
Realized the universe is always expanding. Proposed the theory of the Big Band -
Henrietta Leavitt
Studied stars and found out how to find the stars' distance from earth from the luminosity. -
Edwin Hubble
Found the speed at which galaxies move away from each other. -
Robert Wilson
Discovered cosmic microwave background radiation. This was created in the birth of the universe. This helped scientists find more about the Big Bang. -
Fred Hoyle
Found out all the elements in the universe were made in the stars. However he didn't think the Big Bang existed. -
Harlow Shapely
Came up with the Goldilocks zone. Found out our solar system wasn't the only one in our galaxy. Found our distance from the sun.