As a young boy Clyde W. Tombaugh learned about astronomy from his father and uncle. He built his own telescope and made detailed drawings of Mars and Jupiter. He sent the drawings to Lowell Observatory in Flagstaff, AZ and was hired to locate a new planet at the edge of the solar system. After 300 days of persistent searching, Clyde found Pluto on February 18, 1930! It was the 9th (and last) planet discovered, and the first by an American. Clyde's discovery turned the scientific world and the public upside down with excitement.