1997 Death Clyde Tombaugh, astronomer, discovered Pluto in 1930, dies at 90 1930 Event Clyde Tombaugh announces discovery of Pluto at Lowell Observatory 1930 Event U.S. astronomer Clyde Tombaugh discovers Pluto 1930 Event Clyde Tombaugh photographs planet Pluto 1906 Birthday Clyde William Tombaugh, U.S., astronomer, discovered Pluto
