The Cavendish Experiment: In 1797, Henry Cavendish Used Two Small Metal Spheres To Weigh The Entire Earth

If you're struggling, don't despair. Figuring out how to weigh (well, measure the mass) of the Earth took until 1687, and even then we couldn't calculate it until 1798. At the end of the 1600s, Newton proposed the universal law of gravitation: that e... [2355 chars]