Planet Pluto
THE DISCOVERY OF PLUTO Observing the movements of Uranus and Neptune in the late 19 century, American businessman and astronomer Percival Lawrence Lowell came to the conclusion that there must be another celestial body, about the mass of the Earth, behind them. Lowell called it " Planet X" and was looking for the end of his life. In 1929 , his compatriot Clyde William Tombaugh continued his search about a year later, near the specified location. Tombaugh did indeed notice the dot moving toward distant stars Astronomers considered it to be " Planet X" foreshadowed by Lovelace and it was traditionally as named one of the deities of ancient mythology. In 1978, Pluto's satellite Charon was discovered. Carson helped astronomers determine Pluto's mass. It was only 0.2% of Earth's mass. No body of with a such small mass could have had such an impact on Neptune and Uranus as Lowell suggested. Later it turned out that even the mo...