Clyde Tombaugh

On this date in 1930, Kansan Clyde Tombaugh discovered Pluto.

Clyde W. Tombaugh

Then in 1930, Clyde W. Tombaugh discovered Pluto, and for the next 76 years the planets happily remained at nine—the number that most of us remember from grade school.

Kansan Clyde Tombaugh

On this date in 1930, Kansan Clyde Tombaugh discovered Pluto.

at Lowell Observatory

United Stateswas at the Lowell Observatory that the dwarf planet Pluto was discovered in 1930 by Clyde Tombaugh.