Who Discovered Pluto? Pluto was discovered in 1930 by Clyde Tombaugh. Astronomers noticed that the orbits of Neptune and Uranus were being affected by the gravity of an unknown object in ths solar system. Clyde Tombaugh carefully studied images of the night sky and after a lot of hard work he finally discovered Pluto. Clyde Tombaugh was only 24 years old when he made this discovery.