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Ptolemy
Born 90AD-168AD
Ptolemy thoght the sun,stars, and planets seem to revolve around Earth. They also thought the Earth didn't move. -
Feb 19, 1473
Nicholas Copernicus
Born 1473-1543
Copernicus thought all spheres revolve around the sun at their mid-point. The Earth revolves and rotates so it has more than one motion. -
Feb 15, 1564
Galileo Galilei
Born 1564-1642
Galileo explained that Venus has phases like the moon and he discovered lots about the milky way. He also improved the telescope and used it to look at the heavens -
Sir Isaac Newton
Born 1643-1727
Newton explained that every massive particle in the universe attracts every other massive particle with a force called gravity. -
Johannes Kepler
Born 1643-1727
He calculated and recalculated the orbit of Mars and he concluded that all planets move in ellipses.
