On 1930, Clyde Tombaugh young astronomer spent numerous nights at the telescope exposing photographic plates and months tediously scanning them for signs of a planet. At around 4pm on the afternoon of 18 February 1930 Tombaugh began comparing two plates taken in January that year showing a region in the constellation of Gemini. As he flicked from one plate to the other, trying to see if something moved slightly between the two (the tell-tale sign of the planet he was hunting), he spotted something. In one part of the frame a small object flitted a few millimeters as he switched between the two plates. Tombaugh had found his new planet! Pluto!

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0:00 - Mysteries Pluto Intro
1:04 - Timeline of Planets discovery on Solar System
3:18 - Discovery of Pluto
5:24 - New Horizons Mission
6:35 - IAU Planet definition
9:18 - Dwarf Planets
10:24 - Pluto Mission
12:05 - Pluto Snail Mystery
12:54 - Will Pluto be a Planet Again?

Sources:
https://www.iau.org/public/themes/pluto/
https://www.space.com/pluto-flyby-new...
http://pluto.jhuapl.edu/

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