Like we all used to know, Pluto was the ninth planet from the sun and in our solar system. However until 2006 it was officially named as a dwarf planet. I will talk about why it became a dwarf planet later on. According to nasa.gov and wikipedia.org,  in the late 19th century American astronomer Percival Lowell first caught hints of Pluto’s existence in 1905 from odd deviations he observed in the orbits of Neptune and Uranus, suggesting that another world’s gravity was tugging at them from beyond. On March 19, 1915, Lowell Observatory had captured two faint images of Pluto but they were not recognizable for what they were. During the 1930’s  Clyde Tombaugh used a machine called the blink comparator to image the night sky in photos that was taken two weeks apart. He would then examine and analyze the photos to see if any object had shifted position. On February 18, 1930, Tombaugh discovered a possible moving object on photographic plates taken on January 23 and January 29 of that year.  And finally on March 13, 1930, the discovery of Pluto was publicly announced. Here are the images that were taken: 

There were over 1,000 name suggestions for Pluto, they ranged from Atlas to Zymal. The name pluto was suggested by Venetia Burney from England.  Lowell Observatory had to pick from the best three and they were either Minerva, Cronus, and Pluto. The name was announced on May 1, 1930. Pluto in Greek mythology was the name for the ruler of the underworld. This name fits the planet perfectly because of its coldness and dark location.