Clyde Tombaugh's Second Photograph Essay

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At the Lowell observatory in Flagstaff, Arizona, on February 18, 1929 an Astronomer named Clyde Tombaugh couldn’t believe what he was seeing through an eyepiece on a machine called a blink comparator Tombaugh examined to photos of the gemini constellation each showed the same glimmering stars but the pictures were not identical the second photograph was taken a week after the first and during that time something had changed the astronomer saw that a tiny beacon of light a mere pinprick was in a different place in the second photograph than it had ben in the first
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