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195 BCE
Eratosthenes
He used the Sun to measure the size of the Earth and noted that it was round. -
168
Claudius Ptolemy
Set up a model of the solar system where the Sun, stars and planets revolved around the Earth. It was called the Ptolemaic system. -
1543
Nicolaus Copernicus
He discovered that our solar system was heliocentric. That means that the Sun was in the center. -
Tycho Brahe
He measured one minute to arc. This was important because it gave his own picture of the universe. That the Sun revolved around the Earth. -
Johannes Kepler
He found the 3 laws of planetary motion. These were important because this is what Newton used to discover universal gravitation. -
Sir Isaac Newton
He discovered gravity because an apple fell on his head. -
Albert Einstein
He discovered that the laws of physics are the same throughout the universe. That the speed of light is constant.