On this 90 years ago, the ninth planet in our solar system was discovered by Clyde Tombaugh at Lowell Observatory in Flagstaff. They're going all out to observe this historic day and celebrate the first American to discover a planet.
Pluto discovery made in Flagstaff 90 years ago
On this 90 years ago, the ninth planet in our solar system was discovered by Clyde Tombaugh at Lowell Observatory in Flagstaff. They're going all out to observe this historic day and celebrate the first American to discover a planet.
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