Discovery of Pluto
“Lowell Observatory, Flagstaff, February 18, 1930. Clyde Tombaugh peers into a blink comparator at two photographic plates. Foreground shows the comparator and Tombaugh's pencil-marked plates with the new dot of Pluto; midground reveals notebooks and a portrait of Percival Lowell; the observatory's wooden dome dim in night light frames a young astronomer who has just found a planet.”
