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Ptolemy
Ptolemy came up with the geocentric theory of the universe -
Johann Bayer
He assigned Greek letters to stars using the Bayer designition of stars. -
Galileo
Uses a telescope and discovers 4 Jovian moons, the moon's crater, and the Milky Way galaxy. -
Ole Romer
Danish astronomer Ole Romer measured the speed of light in Paris, France. -
Modern Astronomy
Newton published his theory of gravitation in the Philosophiae Naturalis Principia Mathematica in England. -
Albert Einstein
He introduces his overall theory of Relativity. -
Hubble Space Shuttle
Showed other galaxies exist outside of the Milky Way. -
Orbiting Earth
John Glenn was the first American to orbit the Earth -
Challenger Disaster
Space shuttle exploded a few minutes after lift off. -
Mars
Evidence for water on Mars was discorvered