Happy birthday to famed physicist and mathematician Isaac Newton, born on this day in 1642. In 1687, Newton published a remarkable discovery. He figured out that the same force that causes an apple to fall to the ground also keeps the Moon in Orbit around Earth.
This description of gravity was considered scientific law until Einstein’s General Theory of Relativity, published more than two centuries later. Newton had explained gravity as a force that instantaneously acts over a distance. The result is a pull between any two objects in the universe. This concept of gravity is most familiar today.
When Isaac Newton was asked why the planets’ orbits are elliptical he wasn’t sure, but went home to think about it. He then "invented" differential and integral calculus to explain why. And he was only 26 year-old at that time.