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Isaac Newton
Isaac Newton develops his three laws of motion which will later be used by other scientists in the field of cosmology. -
William Herschel
William Herschel discovers Uranus, this is the first new planet in our solar system to be discovered since ancient times. -
Pierre-Simon Laplace
crucial contributions in the arena of planetary motion by applying Sir Isaac Newton’s theory of gravitation to the entire solar system. -
Georges Lemaitre
Georges Lemaitre writes a paper on the big bang theory -
Henrietta Leavitt
discovered the relation between the luminosity and the period of Cepheid variable stars. -
Percival Lowell
fueled speculation that there were canals on Mars. He founded the Lowell Observatory in Flagstaff, Arizona, and formed the beginning of the effort that led to the discovery of Pluto 14 years after his death. -
Albert Einstein
Albert Einstein publishes his special theory of relativity -
Harlow Shapley
Shapley did his revolutionary research on the scale of the galaxy. -
Edwin Hubble
He discovered that the universe is expanding. -
Fred Hoyle
the theory of stellar nucleosynthesis, -
Arno Penzias and Robert Wilson
The accidental discovery of cosmic microwave background radiation -
Willem de Sitter
a solution for Einstein's general relativity in which there is no matter and a positive cosmological constant.