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1508
Nicolaus Copernicus
Proposed that the sun was stationary in the centre of the universe and the earth revolved around it -
Tyco Brahe
Developed the Tychonian Quadrant that measure and fixes the position of the stars, one of which being -
Johannes Kepler
Discovered the three major laws of planetary motion -
Isaac Newton
Formulated the theory of universal gracity -
William Shapley
Accidentally discovered Uranus -
Pierre-simon Laplace
Announced the invariability of planetary means motion (average angular velocity) -
Percival Lowell
Discovered Pluto by predicting the existence of a planet beyond the orbit of Neptune -
Henrietta Leavitt
Discovered a relationship between period and luminosity (pulsating stars) -
Harlow Shapley
Determined the galactic centre of the milky way -
William de Sitter
Developed theoretical models of the universe based on Albert einstein's general theory of relativity -
Albert Einstein
Had made a theory that space and time were intertwined in an infinite "fabric" and the theory of relativity -
Georges Lemaître
Formulated the idea of the big bang theory and he called "hypothesis of the primeval atom" or the "cosmic egg" -
Edwin Hubble
Discovered that the universe is expanding and countless galaxies exist beyond our own milky way -
Fred Hoyle
Proved that the great majority of natural elements in the periodic table were made inside stars and distributed through space by supernova explosions -
Arno Penzias and Robert Wilson
Discovered the CMB (cosmic microwave background radiation)