时间:2018-12-08 作者:英语课 分类:VOA常速英语2013年(十二月)


英语课

 



ESA to Make 3D Map of Milky 1 Way 欧洲太空总署绘制银河系的3D地图


The European Space Agency this week successfully launched the star-mapping satellite Gaia on a mission that will take it more than a million kilometers from Earth - to  create the first three-dimensional (3D) map of our galaxy 2, the Milky Way.


The two-ton satellite, launched from the European Space Agency’s center in French Guiana aboard a Russian Soyuz rocket, reached the initial orbit and deployed 3 a 10- meter circular sunshield to keep the instruments on-board, including a telescope, cool.  In order to focus on very distant and faint stars, Gaia has to be mechanically  and thermally 4 stable, so it has almost no moving parts.


Mark McCaughrean, the mission's chief scientist, says, “It will measure the positions of a billion stars but also their speeds, their motions. And with that we can  run a movie of the Milky Way.  We can run it forwards, into the future, how the Milky Way will develop by looking at all the stars and how they move. But we can run it  backwards as well, and we can see how the Milky Way actually formed in the first place.”


Gerard F. Gilmore, a professor at Cambridge University's Institute of Astronomy, says the three-dimensional picture will eventually cover half of the Milky Way and  provide new knowledge about what keeps it together.


“And the particular interest that I have in here, locally, is in the nature of dark matter," he said. "What is dark matter made of? Dark matter is most of the weight  in the Milky Way. It is dark matter that holds the Milky Way together. If there weren′t all this dark material, our sun would fly off...away from the galaxy. The  whole galaxy would fall apart.”


The Gaia satellite will be moved to a distance of 1.5 million kilometers from Earth, to a gravitationally stable point called L2, where it will start its five-year  mission of taking approximately 70 images of each star in our galaxy, building a catalog of about one billion stars.


L2 is also designated as the parking space for NASA’s supersensitive infrared 5 James Webb Space Telescope, scheduled for launch in 2018.


The overal cost of the Gaia mission is around $1.3 billion.




1 milky
adj.牛奶的,多奶的;乳白色的
  • 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。
2 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。
3 deployed
(尤指军事行动)使展开( deploy的过去式和过去分词 ); 施展; 部署; 有效地利用
  • Tanks have been deployed all along the front line. 沿整个前线已部署了坦克。
  • The artillery was deployed to bear on the fort. 火炮是对着那个碉堡部署的。
4 thermally
热地
  • The magnetizing field is then removed while the body is thermally isolated. 在该物体热绝缘时把磁场撤去。
  • They could thermally desorb these ions by heating the foil to red heat. 他们通过加热金属箔至红热以解吸这些离子。
5 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。
学英语单词
.snd files
a. ilica communis
Acer sino-oblongum
adaptable stage
aminium ion
antierythropoietin
bito
blondness
blood flowmeter
bustes
byte memory address
Callesen
Camellia flavida
Cardiogafin
Carniolan honeybee
chronic threshold dose
Codington County
compensating valve
conidioaleuria
context sensitivity grammar
creative decision
dacryocanalicular
deposit coal
destination node address
deterrent example
dictyostelids
Doxtriferron
draws upon
entire human being
equal appearing intervals
equilibratings
Eremurus inderiensis
ethylene rectification tower
exemplarism
Fasciculotomy
final work
financial statement
folk devils
full sensitivity contrast
glomma (glaama)
gravure cylinder etching machine
heptylene diacid
Hermit of St.Augustine
hermodactyl
high altitude biology
higher order element
How goes the enemy?
Huong Vy
hydrated magnesium silicate
hydrotylosin
IDFT
imprintable
infourme
intangles
international macroeconomics
Itanhém
jaw-bones
job capacity
Kotalahti
lachnum pteridophyllum
leading truck box cellar lid pin
low clearance
lower wing
Macgeea
meningomyelocele
metal mesh
moving-bed
nanoforce sensor
neckera neckeroides
neutron slowing-down theory
nonimmune anemia
not give tuppence for sth
open cell expanded rubber
orifical
paraldehydes
Parkinson's syndrome
prunus serotinas
quackgrasses
relubricating
Rhabdonema
scale papilla
scandalize
selfclosing
set something to music
shank clearing
Smögen
special proxy
sphincter muscles
streetlife
thriftyness
TMJR
travelocity
triatomic excimer
Twitterstorm
ungrazed area
unideal
visible ore
VoiceLink
well-engineered
Wolff rearrangement of diazoketones
work ship
wtop