Gravity is a simple concept, but the “why” and the “how” are magnificently complicated. How much of gravity do we actually understand?
Isaac Newton was born in the 17th century. Galileo had already seen the movements of Jupiter’s moons and the scars on the moon, but he died year Newton was born. Because of Galileo, we knew the universe was not the perfect, flawless one that some religious philosophers believed.
After Galileo put an end to Ptolemy’s geocentric theory, Isaac Newton helped describe orbital dynamics. He also invented calculus, made the first hypotheses on optics and the composition of light, and updated Kepler’s laws with his 3 laws of motion. And, on top of all that, he came up with the Law of Universal Gravitation.
But what is gravity, really?