ABSTRACT
It was in 1930 that my old friend Clyde Tombaugh discovered Pluto. He was making a deLberate search for a trans-Neptunian planet, using a fine refractor specially installed at the Lowell Observatory in Arizona; it had been Percival Lowell who had predicted the position of a new world. Pluto turned up very close to the position given by Lowell, but ever since then it has presented astronomers with puzzle after puzzle.
