时间:2018-12-05 作者:英语课 分类:国家地理2008年


英语课

Rho Ophiuchi dark cloud is one of the closest star-forming regions to our own solar system. Located near the constellations 1 Scorpius and Ophiuchus, the nebula 2 is about 407 light years away from Earth.


The infrared 3 astronomical 4 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 6 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 8 from 3.6 to 8 microns. Widening the coverage 9 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 10. In visible eye, they can't be seen at all, which is why astronomers 11 rely on Spitzer's infrared perspective to help study the hidden universe.


1. infrared : adj.  红外线的


of or being rays of light of long wavelength 7 that cannot be seen but give heat.


 2. galactic : adj.


relating to a galaxy 12


 3. filament 5 : n.


 a very thin thread or wire; e.g. an electric filament


 4. shock front :


The boundary between the pressure disturbance 13 created by an explosion (in air, water, or earth) and the ambient atmosphere, water, or earth.


 5. gobble up :


to eat something very quickly, especially in an impolite or greedy way


 6. yield : v.


to produce a result, answer, or piece of information


 7. proto- : esp. tech


first in time or order, especially having others come after it or develop from it; original


e.g. protostellar, protogalaxy


 



1 constellations
n.星座( constellation的名词复数 );一群杰出人物;一系列(相关的想法、事物);一群(相关的人)
  • The map of the heavens showed all the northern constellations. 这份天体图标明了北半部所有的星座。 来自《简明英汉词典》
  • His time was coming, he would move in the constellations of power. 他时来运转,要进入权力中心了。 来自教父部分
2 nebula
n.星云,喷雾剂
  • 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。
3 infrared
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。
4 astronomical
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。
5 filament
n.细丝;长丝;灯丝
  • The source of electrons in an electron microscope is a heated filament.电子显微镜中的电子源,是一加热的灯丝。
  • The lack of air in the bulb prevents the filament from burning up.灯泡内缺乏空气就使灯丝不致烧掉。
6 filaments
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
7 wavelength
n.波长
  • The authorities were unable to jam this wavelength.当局无法干扰这一波长。
  • Radio One has broadcast on this wavelength for years.广播1台已经用这个波长广播多年了。
8 wavelengths
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
9 coverage
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。
10 rendering
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。
11 astronomers
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》
12 galaxy
n.星系;银河系;一群(杰出或著名的人物)
  • 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。
13 disturbance
n.动乱,骚动;打扰,干扰;(身心)失调
  • He is suffering an emotional disturbance.他的情绪受到了困扰。
  • You can work in here without any disturbance.在这儿你可不受任何干扰地工作。
学英语单词
absolute democracy
accept an apology
animation controller
anthro
ascending trajectory
average depth bias
banked radiators
binary sequences
cash customer
cave breccia
circumstance
clematine
colleague
commercial agency
crook one's elbow
desert dome
diammine tin chloride
draw-bar height
durkheims
effect of population control
elastic potential scattering
ethylene-tetrafluor-ethylene
exclusive transportation service
fashion merchandising policy
finger-pointing
flexible cover
follow-the-pointer dial
foramen of vena cava
free-dinners
fronto-iliacus
galvanized wire rope clip
go back in time
happy money
Hasner's valves
high-speed sequential processing
hindered amine
Home and hearth
hot pressed
hypoxaemias
in a manner that
in narrow circumstances
iodopovidone
ISLAMABAD
jumpout
kelliher
Kelme
kitchen appliance
labrum-epipharynx
Laclede County
lesser yellow trefoils
lilium compound antiphlogistic pill
loquacious
losing bid
low ductile alloy
lsit of drivers
maximum heat load
microbiostatic
mike up
milleb wood
minced sausage
motor sweeper
Myricaria pulcherrima
Namsos
nantenine
national education research association (nera)
never come to anything
nose-jewel
oscillating element
photoconductive tube
pigment wiping filler stain
pleurocentesis
practisants
property developer
proposed parameter
Psilotineae
Quisqualis indica L.var.villosa Clarke
radiodensities
ram sth into sb's head
redundant path
Ridgetown
Riebeek-Wes(Riebeek West)
runway alignment
sales index
semi rural
sequential detector
shaft elevator
shehadehs
show temper
Simplified Technical English
Soto-Hall sign
sphingomyelin lipidosis
spinetta
sue and labour clause
superceding
synoecize
therioma
tree increment plot
triebelina shoufinnae
unfavourable defect
vergette
weigh sth down
wind machine