Essay on Pluto : Expelled From The Solar System Class !

1281 Words Jun 1st, 2015 6 Pages
Pluto: Expelled from the Solar System class!

In the summer of 2006 planet Pluto’s title was taken away by the International
Astronomical Union. A planet in its own right since it was discovered in 1930 it became a dwarf planet. The media and enthusiasts around the World were shocked, and in the same time sad by this sudden and radical downgrading. According to the institution specified above the reason behind this radical change is due to the fact that Pluto no longer meets the principals that the IAU is used to characterize a full-size planet. The first criteria that the IAU imposes are that a full-size planet is in orbit around the Sun. The second criteria is to have enough mass to assume a hydrostatic equilibrium, and the third is that it has to “cleared the neighborhood” around its orbit.
Basically, Pluto meets all the requirements with the exception of the last criteria mentioned above. Pluto, the dwarf planet was discovered on 18th of February 1930 by astronomer Clyde
Tombaugh at the Lowell Observatory in Flagstaff, Arizona. Tombaugh’s, colleague astronomer
William Pickering was also a significant contributor in this discovery. It all begin when Percival
Lowell the founder of the Lowell Observatory, begin in 1906 a large project hoping that he would discover a 9th planet in our Solar System. Prior to Lowell there were an additional sixteen pre-discoveries the oldest being made on 20th of August 1909 at the Yerkes Observatory. An interest in…

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