Astronomer who discovered Pluto, which is no longer considered a planet. He discovered nearly 800 asteroids as well as numerous stars and galaxy clusters.
His detailed drawings of Jupiter and Mars, with the use of his own homemade telescopes, landed him a job offer with the Lowell Observatory.
He was one of the first scientist to call for the serious scientific research of unidentified flying objects, or "U.F.O.s.
He married Patricia Esdon in 1934, the couple had two children.
He discovered Pluto, but the inspiration for its name came from Percival Lowell.