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SSS 2008-03-13

时间:2010-05-13 03:21来源:互联网 提供网友:0922013129   字体: [ ]
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This is Scientific American's 60-Second Science. I'm Steve Mursky. Got a minute?

 Orbiting around stars far far away is sand. Astronomers1 have found sandy particles circling a pair of stars about 2,400 light years from us. And they think they might be seeing the very beginnings of the formation of an earth-like planet. The researchers reported their findings online in the journal Nature. The sandy stuff is orbiting the stars at about the same distance from them as the earth orbits around the sun. The stars are babies themselves. They are called KH-15D and there are only 3 million years old compared with our sun's mature 4.5 billion years. They are in the constellation2 Monoceros in the Cone3 Nebula4. Other studies of particles around distant stars relied on infrared5 heat data. But astronomers in this research were able to observe reflected light from the sand itself. Study co-author  Christopher Johns-Krull from Rice University said precisely6 how and when planets form is an open question,we believe the disc shaped clowds of dust around newly formed stars condense forming microscopic7 grains of sand that eventually go on to become pebbles8, boulders9 and whole planets.

 

Thanks for the minute, for Scientific American's 60-second Science,I'm Steve Mursky.
 


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1 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》
2 constellation CptzI     
n.星座n.灿烂的一群
参考例句:
  • A constellation is a pattern of stars as seen from the earth. 一个星座只是从地球上看到的某些恒星的一种样子。
  • The Big Dipper is not by itself a constellation. 北斗七星本身不是一个星座。
3 cone lYJyi     
n.圆锥体,圆锥形东西,球果
参考例句:
  • Saw-dust piled up in a great cone.锯屑堆积如山。
  • The police have sectioned off part of the road with traffic cone.警察用锥形路标把部分路面分隔开来。
4 nebula E55zw     
n.星云,喷雾剂
参考例句:
  • A powerful telescope can resolve a nebula into stars.一架高性能的望远镜能从星云中分辨出星球来。
  • A nebula is really a discrete mass of innumerous stars.一团星云实际上是无数星体不连续的集合体。
5 infrared dx0yp     
adj./n.红外线(的)
参考例句:
  • Infrared is widely used in industry and medical science.红外线广泛应用于工业和医学科学。
  • Infrared radiation has wavelengths longer than those of visible light.红外辐射的波长比可见光的波长长。
6 precisely zlWzUb     
adv.恰好,正好,精确地,细致地
参考例句:
  • It's precisely that sort of slick sales-talk that I mistrust.我不相信的正是那种油腔滑调的推销宣传。
  • The man adjusted very precisely.那个人调得很准。
7 microscopic nDrxq     
adj.微小的,细微的,极小的,显微的
参考例句:
  • It's impossible to read his microscopic handwriting.不可能看清他那极小的书写字迹。
  • A plant's lungs are the microscopic pores in its leaves.植物的肺就是其叶片上微细的气孔。
8 pebbles e4aa8eab2296e27a327354cbb0b2c5d2     
[复数]鹅卵石; 沙砾; 卵石,小圆石( pebble的名词复数 )
参考例句:
  • The pebbles of the drive crunched under his feet. 汽车道上的小石子在他脚底下喀嚓作响。
  • Line the pots with pebbles to ensure good drainage. 在罐子里铺一层鹅卵石,以确保排水良好。
9 boulders 317f40e6f6d3dc0457562ca415269465     
n.卵石( boulder的名词复数 );巨砾;(受水或天气侵蚀而成的)巨石;漂砾
参考例句:
  • Seals basked on boulders in a flat calm. 海面风平浪静,海豹在巨石上晒太阳。 来自《简明英汉词典》
  • The river takes a headlong plunge into a maelstrom of rocks and boulders. 河水急流而下,入一个漂砾的漩涡中。 来自《简明英汉词典》
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