Another sighting by Tombaugh a year or two later while at a White Sands observatory was of an object of 6 magnitude, four times brighter than Venus at its brightest, going from the zenith to the southern horizon in about 3 seconds. Source: Internet
Discovery of other trans-Neptunian objects After Pluto's discovery, American astronomer Clyde Tombaugh continued searching for some years for similar objects, but found none. Source: Internet
He would understand they had a real problem when they start finding several of these things flying around the place." citation Hal Levison offered this perspective on Tombaugh's place in history: "Clyde Tombaugh discovered the Kuiper Belt. Source: Internet
In August 1992, JPL scientist Robert Staehle called Tombaugh, requesting permission to visit his planet. Source: Internet
Discovery of Pluto main Clyde William Tombaugh Lowell's sudden death in 1916 temporarily halted the search for Planet X. Failing to find the planet, according to one friend, "virtually killed him". Source: Internet
Following his discovery of Pluto, Tombaugh earned bachelor's and master's degrees in astronomy from the University of Kansas in 1936 and 1938. Source: Internet