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18/02/1930 Dwarf planet Pluto is discovered

45:32

A True Story About Planet Pluto: | Passport to Pluto and Beyond

1:14

Dwarf planet Pluto reacts to discovery of 'Planet Nine'

58:34

The Year of Pluto - New Horizons Documentary Brings Humanity Closer to the Edge of the Solar System

7:42

Reflections on Clyde Tombaugh

American astronomer Clyde Tombaugh spotted a moving point when comparing two photographic plates taken six days apart the previous month. He realized that it is probably the Planet X that astronomers were searched for nearly 30 years. Later it was named Pluto, after an ancient god of the underworld.
    • Essentials 

    • History 

    • Orbit 

    • Rotation 

    • Geology 

    • Mass and size 

    • Atmosphere 

    • Satellites 

    • Origin 

    • Observation and exploration