Clyde Tombaugh
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Discovering Pluto
Young Astronomers Blog, Volume 28, Number 4. Remember Pluto? Yes, Pluto. It was a planet for a long time, then it wasn’t. Pluto was discovered ninety years ago on February 18, 1930. This is the story. Shortly before the turn of the century, that is the turn of the 19th century, there were five planets,…