![]() Newton ruled for two-and-a-half centuries before Albert Einstein turned up in 1915 to usurp him with his General Theory of Relativity. According to his ideas we orbit the sun because it is pulling on us, the moon orbits Earth because we are pulling on it. He said all objects with mass have a gravitational attraction towards each other. Then Isaac Newton came along to explain that gravity is why the planets orbit the sun. Despite much initial opposition, the old geocentric picture eventually buckled under the weight of evidence from the newly invented telescope. Then Nicolaus Copernicus stuck his neck out to say that the whole system would be a lot simpler if we are just another planet orbiting the sun. First, we thought Earth was at the center of the solar system - an idea that stood for over 1,000 years. ![]() ![]() This has happened many times in the history of physics and astronomy. ![]()
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