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Period: to
Isaac Newton
Suggested planets moved because of gravity, movement of planets matched his theory of gravity, described the movement of planets with laws of motion. -
Period: to
William Herschel
found the planet Uranus and its two moons -
Period: to
Pierre-Simon Laplace
applied Newtons theory to the entire solar system. -
Period: to
Percival Lowell
Predicted the existence of Pluto -
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Henrietta Leavitt
discovered the period-luminosity relation of Cepheid variables, which was the starting point for astronomers to determine the distance of stars from the earth. -
Period: to
Willem de Sitter
believed that the universe was ever-expanding -
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Albert Einstein
believed that time does not pass at the same speed everywhere, predicted existence of black holes, said that a rocket travelling at the speed of light will have a higher mass than one not moving. -
Period: to
Harlow Shapley
he estimated the size of the milky way, and the suns position within it. -
Period: to
Edwin Hubble
suggested our galaxy was one of billions and ever-expanding, Hubble telescope name after him. -
Period: to
Georges Lemaître
proposed the Big Bang, and the theory of the expansion of the universe -
Period: to
Fred Hoyle
stated that the universe was created in one moment, and named it the Big Bang -
Period: to
Arno Penzias and Robert Wilson
discovered a cosmic microwave background radiation, believed to be a faint afterglow of the Big Bang