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Há 1 dia · Pluto was discovered in 1930 by Clyde W. Tombaugh, making it by far the first known object in the Kuiper belt. It was immediately hailed as the ninth planet , but it was always the odd object out, [15] : 27 and its planetary status was questioned when it was found to be much smaller than expected.
- 4.743 km/s
- Clyde W. Tombaugh
- February 18, 1930
- Lowell Observatory
