SSS 2008-03-13
时间：2019-01-08 作者：英语课 分类：Scientific American(三)月
This is Scientific American's 60-Second Science. I'm Steve Mursky. Got a minute?
Orbiting around stars far far away is sand. Astronomers 1 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 constellation 2 Monoceros in the Cone 3 Nebula 4. Other studies of particles around distant stars relied on infrared 5 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 precisely 6 how and when planets form is an open question,we believe the disc shaped clowds of dust around newly formed stars condense forming microscopic 7 grains of sand that eventually go on to become pebbles 8, boulders 9 and whole planets.
Thanks for the minute, for Scientific American's 60-second Science,I'm Steve Mursky.
- 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》
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。