On March 13, 1781, the planet Uranus was discovered by William Herschel. Herschel was a church organist and music director in the city of Bath, England. But he dabbled in other pursuits, and astronomy was his passion. Using a telescope he had built himself, he became the first person in history to discover another planet too faint to be seen with the unaided eye. About a hundred and fifty years after Uranus was discovered, the Lowell Observatory in Arizona announced the discovery of another planet. It had been found by a young observatory assistant, Clyde Tombaugh, and was named Pluto. Several years ago an international group of astronomers who had nothing better to do with their time voted to demote Pluto to dwarf planet status, but the American Astronomical Society opposes the idea. In the summer of 2015 a space probe named New Horizons flew past Pluto and radioed back some incredible images of this distant world and its moons.