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SSS 2010-07-23

时间:2010-08-05 07:30来源:互联网 提供网友:konicaqq   字体: [ ]
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    (单词翻译:双击或拖选)

Here’s what scientists think happened, oh, about a hundred million years ago. There was this three-star system. The three linked stars were strolling through the galaxy1 but got too close to the giant black hole at the center. The hole swallowed one of those stars and hurled2 away the other two. Those two careening stars merged3 to form one super-hot, incredibly fast-moving blue star, which is now on the very outskirts4 of the Milky5 Way.

And here’s how scientists came up with that dramatic tale, which they just published in Astrophysical Journal Letters.

They discovered what they call a hypervelocity star, which moves three times faster than our sun does through the galaxy. According to new information provided by the Hubble telescope, the star originated deep within the Milky Way.

The scientists used the Hubble to figure out the direction of the star’s travels and the distance from the galactic center, along with the star’s mass, age and speed. Its unusual attributes give rise to the idea that one star was swallowed and transferred its momentum6 to the other two, which transformed into a blue superstar. Hurtling through the galaxy, faster than a speeding sun.

Thanks for the minute for Scientific American’s 60-Second Science. I’m Cynthia Graber


点击收听单词发音收听单词发音  

1 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。
2 hurled 16e3a6ba35b6465e1376a4335ae25cd2     
v.猛投,用力掷( hurl的过去式和过去分词 );大声叫骂
参考例句:
  • He hurled a brick through the window. 他往窗户里扔了块砖。
  • The strong wind hurled down bits of the roof. 大风把屋顶的瓦片刮了下来。 来自《简明英汉词典》
3 merged d33b2d33223e1272c8bbe02180876e6f     
(使)混合( merge的过去式和过去分词 ); 相融; 融入; 渐渐消失在某物中
参考例句:
  • Turf wars are inevitable when two departments are merged. 两个部门合并时总免不了争争权限。
  • The small shops were merged into a large market. 那些小商店合并成为一个大商场。
4 outskirts gmDz7W     
n.郊外,郊区
参考例句:
  • Our car broke down on the outskirts of the city.我们的汽车在市郊出了故障。
  • They mostly live on the outskirts of a town.他们大多住在近郊。
5 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。
6 momentum DjZy8     
n.动力,冲力,势头;动量
参考例句:
  • We exploit the energy and momentum conservation laws in this way.我们就是这样利用能量和动量守恒定律的。
  • The law of momentum conservation could supplant Newton's third law.动量守恒定律可以取代牛顿第三定律。
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