Clyde Tombaugh is a proper noun, meaning it is the name of a specific person. Clyde Tombaugh was an American astronomer, which means he studied stars, planets, and other objects in space. He is best known for discovering the planet Pluto in 1930.
In more advanced discussions, you might talk about Clyde Tombaugh's methods of observation or his influence on modern astronomy. For example: - "Clyde Tombaugh's meticulous photographic techniques led to the discovery of Pluto, expanding our understanding of the solar system."
Clyde Tombaugh is an important figure in astronomy, known for his discovery of Pluto.