Credit: Pixabay/CC0 Public Domain In the 17th century, German astronomer Johannes Kepler figured out the laws of motion that made it possible to accurately predict where our solar system's planets would appear in the sky as they orbit the sun. But it wasn't until decades later, when Isaac Newton formulated the universal laws of gravitation, that the underlying principles were understood. Although they were inspired by Kepler's laws, they went much further,