英语听力：自然百科 Rho Ophiuchi Cloud 璀璨的星云
时间：2019-02-26 作者：英语课 分类：自然百科2008年
英语课
Transcript for Reference Only --chunshan
The infrared 1 astronomical 2 satellite, now celebrating its 25th anniversary, gave us the first all sky view of our dusty infrared universe. Floating above the galactic center is the Rho Ophiuchi Cloud, about 400 light years away, it's one of the most spectacular nearby star-forming regions. NASA's Spitzer space telescope has now given us an impressive new view of this cloud's central core.
Compact yellow green arcs and filaments 3 are shock fronts from proto-stellar jets within the cloud. These jets shoot out from young stars still growing as they gobble up the surrounding dust and gas. Here we see infrared light with wavelengths 4 from 3.6 to 8 microns. Widening the coverage 5 to include 24 microns yields an even richer array of colors that shed light on the temperature and composition of the dust here.
The cloud is named after the nearby star Rho Ophiuchi which ironically is not thought to be associated with the star-forming region, and does not appear in the Spitzer image. Also known as Lynds 1688, this region contains over 300 baby stars with ages of up to a few hundred thousand years. The dusty envelopes around the younger stars make them appear red in this rendering 6. In visible light, they can't be seen at all, which is why astronomers 7 rely on Spitzer's infrared perspective to help study the hidden universe.
adj./n.红外线(的)
- 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。
adj.天文学的，（数字）极大的
- He was an expert on ancient Chinese astronomical literature.他是研究中国古代天文学文献的专家。
- Houses in the village are selling for astronomical prices.乡村的房价正在飙升。
n.（电灯泡的）灯丝( filament的名词复数 )；丝极；细丝；丝状物
- Instead, sarcomere shortening occurs when the thin filaments'slide\" by the thick filaments. 此外，肌节的缩短发生于细肌丝沿粗肌丝“滑行”之际。 来自辞典例句
- Wetting-force data on filaments of any diameter and shape can easily obtained. 各种直径和形状的长丝的润湿力数据是易于测量的。 来自辞典例句
n.波长( wavelength的名词复数 )；具有相同的/不同的思路；合拍；不合拍
- I find him difficult to talk to—we're on completely different wavelengths. 我没法和他谈话，因为我们俩完全不对路。 来自《简明英汉词典》
- Sunlight consists of different wavelengths of radiation. 阳光由几种不同波长的射线组成。 来自辞典例句
n.报导，保险范围，保险额，范围，覆盖
- There's little coverage of foreign news in the newspaper.报纸上几乎没有国外新闻报道。
- This is an insurance policy with extensive coverage.这是一项承保范围广泛的保险。
n.表现，描写
- She gave a splendid rendering of Beethoven's piano sonata.她精彩地演奏了贝多芬的钢琴奏鸣曲。
- His narrative is a super rendering of dialect speech and idiom.他的叙述是方言和土语最成功的运用。
n.天文学者，天文学家( astronomer的名词复数 )
- 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》