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Clyde Tombaugh was born 4 February 1906 in Streator, Illinois, the son of Muron and Adelle Tombaugh. His family moved to Burdett, [[Kansas]] in 1922. There a [[hail|hailstorm]] destroyed his family's farm crops, so that the family could not afford to send him to college.

Clyde Tombaugh was born 4 February 1906 in Streator, Illinois, the son of Muron and Adelle Tombaugh. His family moved to Burdett, [[Kansas]] in 1922. There a [[hail|hailstorm]] destroyed his family's farm crops, so that the family could not afford to send him to college.

Undaunted, he built his own telescope in 1926. (Apparently he built it out of a kit from the [[Sears, Roebuck and Company]] catalog.) The results did not satisfy him. So he self-educated in the science of [[optics]], and built two more telescopes. He ground his own lenses and mirrors to build these. He drew the [[Solar System]] (as it was then known) from his observations, and sent his drawings to the [[Lowell Observatory]] in [[Arizona]] on or about 1928. The drawings impressed the directors, who invited him to join its staff.

Undaunted, he built his own telescope in 1926. (Apparently he built it out of a kit from the [[Sears]] catalog.) The results did not satisfy him. So he self-educated in the science of [[optics]], and built two more telescopes. He ground his own lenses and mirrors to build these. He drew the [[Solar System]] (as it was then known) from his observations, and sent his drawings to the [[Lowell Observatory]] in [[Arizona]] on or about 1928. The drawings impressed the directors, who invited him to join its staff.

== Principal discovery ==

== Principal discovery ==