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SSS 2008-07-17

时间:2010-05-14 05:36来源:互联网 提供网友:木渐浅。   字体: [ ]
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    (单词翻译:双击或拖选)

This is Scientific American's 60-Second Science,I'm Steve Mirsky,got a minute?

 Our Milky1 Way galaxy2 produces only about 10 new stars annually3. But a galaxy far, far away is experiencing a major baby boom. It’s pumping out up to 4,000 new stars a year, and should become a massive elliptical galaxy. The discovery was announced in the July 10th issue of Astrophysical Journal Letters. The Baby Boom galaxy stood out because of its extreme brightness, a function of all its youthful stars.  That star-making actually happened 12.3 billion years ago—that’s how long it took for the light to reach us. And the universe was virtually a baby itself, only about 1.4 billion years old, when the Baby Boom galaxy activity happened. Astronomers4 don’t know if this is an exceptional case or if most massive elliptical galaxies5 actually formed so early in the universe’s history.

The discovery also challenges the accepted model for galaxy formation, which has most galaxies slowly bulking up by absorbing pieces of other galaxies, rather than growing internally.  Looks like the new finding will be keeping astronomers busy into old age.

Thanks for the minute,for Scientific American's 60-Second Science,I'm Steve Mirsky


点击收听单词发音收听单词发音  

1 milky JD0xg     
adj.牛奶的,多奶的;乳白色的
参考例句:
  • Alexander always has milky coffee at lunchtime.亚历山大总是在午餐时喝掺奶的咖啡。
  • I like a hot milky drink at bedtime.我喜欢睡前喝杯热奶饮料。
2 galaxy OhoxB     
n.星系;银河系;一群(杰出或著名的人物)
参考例句:
  • The earth is one of the planets in the Galaxy.地球是银河系中的星球之一。
  • The company has a galaxy of talent.该公司拥有一批优秀的人才。
3 annually VzYzNO     
adv.一年一次,每年
参考例句:
  • Many migratory birds visit this lake annually.许多候鸟每年到这个湖上作短期逗留。
  • They celebrate their wedding anniversary annually.他们每年庆祝一番结婚纪念日。
4 astronomers 569155f16962e086bd7de77deceefcbd     
n.天文学者,天文学家( astronomer的名词复数 )
参考例句:
  • Astronomers can accurately foretell the date,time,and length of future eclipses. 天文学家能精确地预告未来日食月食的日期、时刻和时长。 来自《简明英汉词典》
  • Astronomers used to ask why only Saturn has rings. 天文学家们过去一直感到奇怪,为什么只有土星有光环。 来自《简明英汉词典》
5 galaxies fa8833b92b82bcb88ee3b3d7644caf77     
星系( galaxy的名词复数 ); 银河系; 一群(杰出或著名的人物)
参考例句:
  • Quasars are the highly energetic cores of distant galaxies. 类星体是遥远星系的极为活跃的核心体。
  • We still don't know how many galaxies there are in the universe. 我们还不知道宇宙中有多少个星系。
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TAG标签:   SSS  galaxy
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