Pluto
Constance Lowell, Percival's widow had a ten-year-long legal battle for Percival's estate. For this reason, the search for Planet X again started in 1929. The director of the mission, Vesto Melvin Slipher, gave the job to Clyde Tombaugh, a 23-year-old Kansas man. Tombaugh had just come to the Lowell Observatory. Slipher had been impressed by his astronomical drawings.