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23/01/1930 Clyde Tombaugh photographs planet Pluto

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Pluto: Timelapse shows dwarf planet from 1930s to 2015

Existence of tenth planet (called Planet X) was predicted by Percival Lowell and William Pickering. Tombaugh used the astrographic camera to take photographs of the same section of sky several nights apart. Then he compared the images and looked for objects that would appear to jump from one position to another.
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