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240 BCE
Eratosthenes
Discovered that the size of Earth was 24,660 miles but was only 211 miles off the true measurement. Everyone then thought the earth was flat but he discovered by using the Sun to measure that the Earth was round. -
127
Claudius Ptolemy
Set up a model of the solar system in which everything revolved around the Earth which is wrong. Astronomers later discovered that everything was revolved around the Sun -
1543
Nicolaus Copernicus
Discovered that the Sun was at the center of the universe rather than the Earth. This is important because the universe revolves around the Sun. -
Tycho Brahe
Discovered that all planets go around the Sun and the Sun goes around Earth. This left the rest of the research for other astronomers. -
Johannes Kepler
Discovered that the planets and objects in space were spheres and he also discovered the laws of planetary motion. This led Newton to discover universal gravitation. -
Sir Isaac Newton
Discovered universal gravitation and established the Newton's laws of motion. -
Albert Einstein
Suggested that the laws of physics are the same throughout the universe and that the speed of light in a vacuum are constant. This is important because he saw that space and time are linked in Space-time and are distorted by gravity
