In the vast history of astronomy, where many discoveries were made through powerful telescopes and hours of stargazing, one man stood out for doing the impossible—discovering a planet with nothing but mathematics and a pen. That man was Urbain Le Verrier, a brilliant French mathematician and astronomer born in 1811. His name might not be as famous as Galileo or Newton, but his achievement was no less extraordinary. He predicted the existence and position of Neptune, the eighth planet from the Sun, before it was ever seen by anyone.