2013年7月15日 星期一

NASA第一次看到太陽系外行星的顏色!

原文網址:http://edition.cnn.com/2013/07/11/world/space-blue-planet/index.html?sr=fb071213azureblueplanet10a


科學透過哈伯太空望遠鏡(Hubble Space Telescope) 看到一顆太陽系外的深藍色行星 (azure blur planet)!
這是人類第一次能夠看到太陽系外行星的顏色!



Extrasolar planets (太陽系外行星)or exoplanet 也是托福常考的一個重點喔!
ETS也常常用很多新聞及其他學術論文為基礎編寫題目,
所以同學平常也可以多注意有關Astronomy, Science, Geology的新聞喔!!

這個名為HD 189733b 的行星,白天溫度可高達華氏2000度 (約攝氏1093度), 高溫使得天空下起液態玻璃!而且他是一顆*gas giant. (類木行星,組成物以氣體為主)

The planet, known as HD 189733b, is a gas giant with a daytime temperature of 2,000 degrees Fahrenheit where it possibly rains liquid glass sideways amid 4,500 mph winds, NASA says.

特別值得一提的是,這個深藍色星球顏色來源並不是像地球一樣反射海洋得來的,而是在攝氏1000多度如此高溫下,矽酸鹽會凝結成小顆粒的玻璃,反射藍光。(聽力可能考的重點!)

The blue color comes not from the reflection of an ocean, as on Earth, "but rather a hazy, blow-torched atmosphere containing high clouds laced with silicate particles," NASA says. "Silicates condensing in the heat could form very small drops of glass that scatter blue light more than red light."

透過紅外線偵測,發現 HD 189733b 早晚溫差高達華氏500度,如此大的溫度差距會導致颶風的產生。

In 2007, NASA's Spitzer Space Telescope measured the infrared light, or heat, from the HD 189733b. It showed day side and night side temperatures differ by about 500 degrees Fahrenheit, which should cause fierce winds to roar from the day side to the night side, NASA said.



沒有留言:

張貼留言