Pluto was discovered 90 years ago this week. Controversy about its identity rages on.
Ninety years ago this week, a young astronomer named Clyde Tombaugh discovered a small, icy object beyond the reaches of the known solar system. It was Pluto. Astronomers had suspected Pluto's existence for about 15 years before that — astronomer Percival Lowell had observed deviations in Neptune …
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