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| 자유 내가 미국 중학교때 쓴 Essay 2 | |||||
| 작성자 | 상사4Awesome | 작성일 | 2008-08-19 02:13 | 조회수 | 69 |
|---|---|---|---|---|---|
| 페르세우스자리의 유성군에 관한글 입니다. Have you ever seen a shooting star? If you have, that means you’ve seen a meteor. And also, have you ever wondered what a meteor shower is and when are the best times to see one? Well, I am going to tell you about a real meteor shower called Perseids in my upcoming paragraphs, and it was pretty interesting _ me. Perseids gets its name from a constellation called Perseus because it appears to radiate from the Perseus. People that live in Northern Hemisphere can see the meteors as early as July 23rd, and about a single meteor can be visible per hour. It is possible to notice five meteors per hour in the beginning of August. The Perseids rapidly increase to a peak of 50 to 80 meteors per hour by the night of August 12th or 13th. But it also decreases to an average of 10 meteors per hour by the night of August 15th. The last night to see the Perseids is most likely August 22nd. _ I was researching, I wondered who discovered the Perseids and when he or she found out about it. And I learned that the credit _ the discovery of the Perseids goes to Adolphe Quetelet. In 1835, Adolphe Quetelet reported that therer was a meteor shower occurring in August that was caught from the constellation Perseus. The first observer to provide an hourly rate of this meteor shower was E. Heis (I couldn’t find his first name) who found a maximum rate of 160 meteors per hour in 1839. In 1858, there was an hourly rate of 37 to 88 meteors per hour. And _ some reason, the hourly rate of the Perseids jumped up to between 78 and 102 in 1861. In 1863, three observers reported that the hourly rate was 109 to 215 per hour. But the hourly rate of the Perseids started decreasing until 1920 when the rate increased tremendously. The hourly rate was as high as 200 meteors per hour! And the rate has been increasing and decreasing since then. Now that you have learned about the Perseids, you might find it interesting, or you might find it boring. And that’s up to you. So my question was, what is a meteor shower, and when are the best times to see one? Well, a meteor shower is an event when you can see a group of meteors flying through the sky at certain times of the year. And the best times to see one is on any clear, dark night, you can see several meteors per hour and you sometimes have to be away from the cities to avoid the glare of their lights. And I’m sure that meteor showers are really interesting to many astronomers. 또 지루 해서 올렸음 ㅎㅎ Go, 해외파!!! |
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