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There is a popular story that Isaac newton was sitting beneath an apple tree when an apple dropped on his head and this inspired him to create his universal theory of gravitation.

The story is probably an exaggeration. In Newton's account of the event he was sitting at his window at his home, Woolsthorpe Manor and watched an apple fall from a tree in the garden which turned his thoughts to gravity.

The real discovery of Newton was not "gravity." The fact that things fall towards the Earth when they are dropped was known in pre-history. It wasn't even to suggest that gravity extended a long way and causes the orbits of the planets. This had already been suggested by Galileo Galilei. What Newton came up with was a formula for how big the force of gravity will be between any two objects and show that this accurately accounts for the motion of the moon and planets.

The formula was so good that it remained in use as the best prediction of gravitational force until Einstein's theory of General Relativity in the 20th Century and is still used today where relativistic effects do not apply.

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Q: What inspired Isaac Newton to develop his law of gravity?
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