Word: tombaugh
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Dates: during 1990-1999
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...astronomer Clyde Tombaugh discovers Pluto, the ninth planet...
...Eventually, the notion of otherworldly life made the transition out of the pages of philosophy and fiction: in 1894, the wealthy astronomer Percival Lowell built his own observatory in Arizona to try to detect the life he believed existed on Mars. He never found it, but in 1930 Clyde Tombaugh, then an assistant at Lowell Observatory and now a professor emeritus at New Mexico State University, found Pluto. It was the last planet that would be discovered until the 1990s...