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Nov 26, 1500
Aristotle's Theory of the Universe
*The date of 350 BC would not fit within the time frame comfortably, so I decided to put here. * Aristotle's thory of the universe was; the earth is in the center of the universe, with all the other planets, including the sun, in orbit around it. -
Nov 26, 1520
Ptolemy theory of the universe
This was in the 2nd centurary AD, which did not fit comfortably on the graph, so for the pleasure for you to look at I placed it here, please forgive the moving of this date.Ptolemy arranged Aristotle ideas by creating a system of circles/ epicycle Which dimenstrate the motions of the planets revolution around the earth. Ptolemy continued to add epicycles to explain the universe -
Nov 25, 1543
Copernicus Universal Theory
The Sun was in the center of the universe and the Earth and other planets orbited around it. -
Newtons Apple
This was when the famous apple that Newton saw fell, when walking through an orchard. He started to question gravity and the acceleration at which things fall. -
Isaac Newton
He proved the previous discorveries found by Keepler and Galileo were true. Any 2 objects in the universe give off a gravitational force on each other, due to there mass. He also wondered, due to an experiment with a cannon, how the forces would act on the moon and what keeps it from falling directly onto earth. He discovered that if you shot a cannon at ehe right speead, it should continue at that speed and travel parral to eath, without every reaching the ground. -
Publish Principia
Newton publish the book Principia, which showed his hypothesis of the inverse-square law of universal gravitation. -
Henry Cavendish Made first measurement of G
The first reliable measurement of G was made. Which was 6.754 10-11 newton-square meter per square kilogram. The gravitation equation was already given, yet the value of G was unknown until his measurements. -
General Relativity
Albert Einstein's theory of general relativity, which proposed that spacetime is curved by matter. Also that free-falling objects are moving along locally straight paths in curved spacetime. This general theory of relaivity approaches the concept of gravity as a distortion of the space time continum, rather than a force.
