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