- Born in Stagira 348 BC and died in 322 BC
- Teacher, Writer, Philosopher.
-Thought that celestial bodies were a sphere and attempted to convince people of his time that his theory was true.
-A method that he used to prove this is observing that during a lunar eclipse, the shadow of the earth is always circular.
-Found that mars is higher up in "heaven" than the moon by seeing the moon pass in front of mars.
-Discovered the physics that which explained change, motion, void and time which made it easier for scientists to study speed and movement of gravity, stars, etc.
-Postulated a fifth element called aether which is believed to be the main content of celestial bodies.
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