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168 BCE
Claudius Ptolemy
He set up a model of the solar system in which the sun, stars, and other planets revolved around Earth -
1543
Nicolaus Copernicus
He proposed a model of the solar system that involved the Earth revolving around the sun -
Tycho Brahe and Johannes Kepler
They determined that planets traveled around the sun not in circles but in ellipses -
Sir Isaac Newton
He calculated three laws describing the motion of forces between objects, known today as Newton's laws -
Albert Einstein
He became one of the most famous scientists ever after proposing a new way of looking at the universe that went beyond current understanding