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[일반] 영어말하기대회 원고(6학년 우수 이경언)
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2010-05-31



 


Pluto: The Ninth Planet?





Jangja elementary school 6-4 Kyung-un Lee





 Hello. My name is Kyung-un Lee.


Today, I''m going to tell you about the Pluto. Do you know about Pluto? Many people think Pluto as one of the planets. So I assume you would know about Pluto. And you probably know that Pluto is not a planet now. Do you know why Pluto is not a planet now? From now on, I''d like to tell you the reason why it is not a planet any more.


 Until recently, Pluto was the ninth planet from the Sun. It was also the smallest planet. But not anymore! What happened? Did it disappear or explode? No, Pluto is still on the edge of our solar system, but it is no longer considered a real planet.


 Pluto was the last planet in our solar system to be discovered, but there were doubts about it right away. Although people knew about planets a long time ago, they could only see five of them with the naked eye. However, the invention of the telescope changed everything.


 Astronomers soon discovered other planets, bringing the total to eight. Then, in 1930, Clyde Tombaugh, an American astronomer, found Pluto. At First, everyone was very excited. But as astronomers studied more about Pluto, they noticed it was different from the other planets because of its small size. It was very small. Its size was also smaller than the moon, and 1/6 of the Earth. They also noticed that Pluto''s orbit was strange. It did not have its own orbit. It also had invaded the orbit of Neptune.


 It was the discovery of the Kuiper Belt, though, that led to Pluto no longer being considered a planet. In 1992, David Jewitt an MIT student, discovered a band of over 1,000 rock and ice objects orbiting the Sun beyond Neptune.


 They all had exactly the same orbit as Pluto. Scientists realized that Pluto had much more in common with these Kuiper Belt Objects (KBOs) than with the other planets. In 2006, the International Astronomical Union (IAU), a group of space scientists, made rules about what can be called a planet. They agreed that a planet must be much bigger than any other object in its orbit. But Pluto is only slightly bigger than other objects in its orbit. So, they said that Pluto was just a large KBO.


 Will Pluto ever be called a planet again?


In 2009, the conference by IAU was held to discuss about whether Pluto can be called as the planet or not. The conclusion came at the meeting. They said that Pluto had lost its position as the planet. So, they judged that Pluto is just bigger than the Kuiper Belt Object. But the history of Pluto will be remained forever in our mind.


Thank you for listening.

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