when Was Pluto Discovered

Being so far away from earth, Pluto was discovered much later than many other moons.

Pluto was first discovered by Clyde Tombaugh at the Lowell Observatory in Flagstaff, Arizona in February 18th, 1930. After Uranus and Neptune were discovered, astronomers started to predict that there are more planets out there in Solar System. Furthermore, they have discovered that those two planets were affected by the gravity of an unknown object in the solar system. Therefore, the director of Lowell Observatory, Vesto Melvin Slipher started a project to find more planets. He assigned Clyde to find the next planet, which they named Planet X.

Clyde worked hard to find Planet X. The key tool that he used was a blink comparator. This tool allowed him to compare two photos of the night sky. He tried to look for any object that has jumped from one night to another night by comparing two pictures. On February 18th, 1930, he observed a dim object in the right orbit. He finally discovered Planet X. After the discovery, it was time to give a name for Planet X. Venetia Burney, an 11-year old British school girl, gave the name Pluto to Planet X. It was named after the Roman god of the underworld.

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