日韩精品久久一区二区三区_亚洲色图p_亚洲综合在线最大成人_国产中出在线观看_日韩免费_亚洲综合在线一区

English 中文網 漫畫網 愛新聞iNews 翻譯論壇
中國網站品牌欄目(頻道)
當前位置: Language Tips> Audio & Video> 新聞播報> Normal Speed News VOA常速

Astronomers listen to stars' 'giant concert'

[ 2010-10-28 12:38]     字號 [] [] []  
免費訂閱30天China Daily雙語新聞手機報:移動用戶編輯短信CD至106580009009

For thousands of years, humans have gazed up at the night sky and watched the stars. Now, NASA's Kepler mission gives scientists the chance to listen to the stars. Astronomers are using stellar soundwaves to measure stars more accurately than ever before.

It might not sound like much.

... but you just heard a star. Actually, a few vibrating red giant stars.

"A Kepler red giant concert, so to say," said Daniel Huber.

That is Daniel Huber, a doctoral student at the University of Sydney in Australia. He is a member of an international team of astronomers that is using data from NASA's Kepler spacecraft to study stars and their structures.

Kepler uses a huge digital camera to continuously monitor the brightness of more than 150,000 stars as it orbits the sun. Huber is among the scientists who study red giant stars, which are nearing the ends of their lives.

Scientists say the stars get older, temperatures near their cores rise and their sizes expand.

"Every red giant that we've detected oscillations in has its unique sound, its unique amplitude and frequency, and we can therefore say that Kepler is basically listening to thousands of "musicians" in the sky," he said.

It comes down to asteroseismology, which is the study of star oscillations. So-called "starquakes" show up as periodic variations in the brightness of the stars. They help asteroseismologists learn about the inner structure of stars in the same way that seismologists use earthquakes to learn about inner Earth.

Travis Metcalfe, a scientist at the National Center for Atmospheric Research in Colorado, says seismology is like taking an ultrasound image. But, he says, the stars generate their own soundwaves from the boiling motions near the surface. Metcalfe explains that soundwaves travel down into the star and bring information back to the surface, which NASA's Kepler spacecraft records as a flickering in the brightness of the star.

"To measure the size of a star, we essentially measure the tone of these musical notes from the starlight," said Travis Metcalfe. "Just as it's easy to hear the difference between a note played on a cello and a violin, larger stars naturally flicker in lower tones, while smaller stars flicker in higher tones."

So, bigger stars sound lower, like a cello, while a smaller star's tone is more like that of a correspondingly smaller violin.

Scientists analyze a star's soundwaves to learn the size, shape and age of that star, and that information helps them understand the way the relationship between stars and their planets evolve.

The tones of stars' soundwaves are so low that even whales would have a hard time hearing them, but Huber says scientists scaled them to the audible range of the human ear. Once again, here are the sounds of several stars, based on actual frequencies measured by Kepler.

Scientists representing the Kepler Asteroseismic Science Consortium presented these stellar sounds and findings during a teleconference Tuesday from Aarhus University in Denmark.

Astronomers who use Kepler data say the mission helps them understand what will become of our Sun in about 5 billion years, and it helps them identify planet-hosting stars as astronomers search for Earth-like planets.

The Kepler spacecraft was launched in March of 2009. NASA praises the mission as an example of international partnership, saying the US space agency provides the spacecraft and data, while hundreds of scientists around the world analyze the findings.

amplitude: the greatest distance that a wave, especially a sound or radio wave, vibrates(= moves up and down) (聲音、無線電波等的)振幅

asteroseismology: 星震學

seismologist: 地震學家

Related stories:

新發現:有顆類地行星適宜生物存活

聯合國任命首位星際外交官 代表人類接觸外星人

Five new planets discovered by NASA's Kepler Spacecraft

Widespread water found on surface of moon

(來源:VOA 編輯:陳丹妮)

 
中國日報網英語點津版權說明:凡注明來源為“中國日報網英語點津:XXX(署名)”的原創作品,除與中國日報網簽署英語點津內容授權協議的網站外,其他任何網站或單位未經允許不得非法盜鏈、轉載和使用,違者必究。如需使用,請與010-84883631聯系;凡本網注明“來源:XXX(非英語點津)”的作品,均轉載自其它媒體,目的在于傳播更多信息,其他媒體如需轉載,請與稿件來源方聯系,如產生任何問題與本網無關;本網所發布的歌曲、電影片段,版權歸原作者所有,僅供學習與研究,如果侵權,請提供版權證明,以便盡快刪除。
 

關注和訂閱

人氣排行

翻譯服務

中國日報網翻譯工作室

我們提供:媒體、文化、財經法律等專業領域的中英互譯服務
電話:010-84883468
郵件:[email protected]
 
 
主站蜘蛛池模板: 欧美精品一区二区三区免费播放 | 婷婷午夜 | 久草中文在线 | 91久久精品一区二区二区 | 九九热爱视频精品视频高清 | 国产精品亚洲综合色拍 | 国产++欧洲韩国野花视频 | 天天爽夜夜爽人人爽 | 天天干干 | 亚洲 久久| 国产免费一区 | 九九视频高清视频免费观看 | 国产亚洲精品sese在线播放 | 精品视频在线观看视频免费视频 | 精品国产第一国产综合精品gif | 亚洲视频在线看 | 午夜欧美一区二区三区在线播放 | 夜夜夜操操操 | 国产精品久久久久一区二区三区 | 亚洲午夜精品一区二区三区他趣 | 日韩色视频 | 欧洲精品在线观看 | 一级黄色免费片 | 一级一片免费看 | 久久精品视频免费观看 | 日本三级韩国三级香港三级 | 亚洲一区二区三区四区在线观看 | 三级在线视频 | 午夜免费视频 | 精品久久久久久久中文字幕 | 欧美最黄视频 | 日韩中文一区 | 欧美精品午夜论理电影 | 日日摸夜夜添免费毛片小说 | 99thz桃花论坛 | 国产成人一级片 | a在线免费观看视频 | 国产精品久久久久一区二区 | caoporn视频 | 99色吧 | 一级片国语 |