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The astronomer Clyde Tombaugh, discoverer of Pluto here shown with his homemade 9-inch telescope. In the image, he is shown standing next to his homemade 9-inch Newtonian telescope. He is dressed formally, wearing glasses, a white shirt, and a tie, and appears to be adjusting or inspecting the telescope. https://commons.wikimedia.org/wiki/File:Clyde_W._Tombaugh.jpeg The telescope itself is a large tube mounted on an equatorial mount, with visible mechanical adjustment components.

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The astronomer Clyde Tombaugh, discoverer of Pluto here shown with his homemade 9-inch telescope. In the image, he is shown standing next to his homemade 9-inch Newtonian telescope. He is dressed formally, wearing glasses, a white shirt, and a tie, and appears to be adjusting or inspecting the telescope. https://commons.wikimedia.org/wiki/File:Clyde_W._Tombaugh.jpeg The telescope itself is a large tube mounted on an equatorial mount, with visible mechanical adjustment components.
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Project Gutenberg (gutenberg_org@mastodon.social)'s status on Thursday, 20-Feb-2025 09:59:53 JST Project Gutenberg

#OTD in 1930.
While studying photographs taken in January, Clyde Tombaugh discovers Pluto, making it by far the first known object in the Kuiper belt. It was immediately hailed as the ninth planet.
However, its planetary status was questioned when it was found to be much smaller than expected. In 2006, the International Astronomical Union (IAU) formally redefined the term planet to exclude dwarf planets such as Pluto.
https://en.wikipedia.org/wiki/Clyde_Tombaugh
#science #astronomy

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