![]() These laws were among the first to explain fundamental aspects of nature with simple mathematical formulas that were useful in a vast range of real life scenarios. Newton’s three laws of motion, published 20 years later in his Principia, established that every object in a state of uniform motion will remain in that state of motion unless an external force acts on it, that force equals mass times acceleration and that for every action there is an equal and opposite reaction. His simple equation for universal gravitation, written in 1666 when he was 23, helped overthrow more than a thousand years of Aristotelian thinking (reinforced by Greek astronomer Claudius Ptolemy) which said that objects only moved if an external force drove that motion. ![]() ![]() The theory helps us predict how objects as large as planets and as small as individual colliding molecules will interact it shows us the way earthquakes ripple through the Earth’s crust and how to build building that can withstand them. Newton’s theory of universal gravitation says that every particle in the universe attracts every other particle through the force of gravity. New Scientist once described Isaac Newton as “the supreme genius and most enigmatic character in the history of science.” His three greatest discoveries - the theory of universal gravitation, the nature of white light and calculus - are the reasons why he is considered such an important figure in the history of science.
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