时间:2018-12-26 作者:英语课 分类:美国英语听力80篇


英语课

[00:05.62]34) Ancient Quasar

[00:11.96]Astronomers 2 have discovered what they say is one of the earliest known structures ever to form in the universe.

[00:20.82]It is a star-like object called a quasar.

[00:24.76]Quasars are very large.

[00:27.69]They produce huge amounts of energy, up to ten thousand times that produced by our solar system.

[00:35.74]Astronomers believe the energy of a quasar is produced by a huge black hole that attracts surrounding matter.

[00:45.77]Several teams of scientists found the ancient object in the constellation 3 Cetus.

[00:52.82]The teams used two telescopes.

[00:55.33]One is the Hale Telescope at Palomar Observatory 4 in California.

[01:01.57]The other is the National Science Foundation's 'telescope at Kitt Peak in Arizona.

[01:08.78]Scientists at the Keck Observatory in Hawaii did a special study of the object's light.

[01:15.94]Daniel Stern is an astronomer 1 with NASA's Jet Propulsion Laboratory in Pasadena, California.

[01:24.69]He played an important part in the recent discovery.

[01:28.92]He says the distant object looked very much like a star.

[01:33.75]However, study of the light from the object proved it to be a quasar.

[01:39.34]He said further study showed the quasar is extremely old.

[01:44.54]Tests showed that light from the object takes about 13,000,000,000,000 light years to reach Earth.

[01:52.54]Scientists say that means the quasar existed at a time when the universe was less than 8% of its current age.

[02:01.94]Tests of the red light from an object in space

[02:06.33]can show how fast the object is moving away from us as the universe expands.

[02:13.77]The faster it moves away, the more its light appears to be a red color.

[02:19.02]Mister Stern says finding a quasar at that distance is like turning on a flashlight at the edge of the universe.

[02:29.19]He says quasars act like very bright flashlights because they are brighter than distant galaxies 5.

[02:37.62]He says this permits astronomers to study everything that has ever developed between Earth and the quasar.

[02:46.27]Mister Stern says the newly discovered quasar will add to the knowledge

[02:52.75]of how matter spread in the early history of the universe.

[02:57.29]He says it also will help show how black holes



1 astronomer
n.天文学家
  • A new star attracted the notice of the astronomer.新发现的一颗星引起了那位天文学家的注意。
  • He is reputed to have been a good astronomer.他以一个优秀的天文学者闻名于世。
2 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》
3 constellation
n.星座n.灿烂的一群
  • 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。
4 observatory
n.天文台,气象台,瞭望台,观测台
  • Guy's house was close to the observatory.盖伊的房子离天文台很近。
  • Officials from Greenwich Observatory have the clock checked twice a day.格林威治天文台的职员们每天对大钟检查两次。
5 galaxies
星系( galaxy的名词复数 ); 银河系; 一群(杰出或著名的人物)
  • Quasars are the highly energetic cores of distant galaxies. 类星体是遥远星系的极为活跃的核心体。
  • We still don't know how many galaxies there are in the universe. 我们还不知道宇宙中有多少个星系。
学英语单词
acid-carbonate
al qahirah (cairo)
Alemli
angeloylfuranofukinol
backstairs intrigue
barterable
benippled
beweapons
bus insurance
charabanc
childhood aphasia
CLHE
cold food pantry
colocalisation
common boneset
common licence
corrupcion
cross countries
cross-country skiing
crystal vessel
cupric fluoride
Diksonskiy Rayon
distributing valve board
double-beam oscillograph
drawbeam
dry foot
EAggEC
electroelute
endodermoreaction
enjoyee
eschewal
extension reflex
ezekiass
filter expresser
Flying Scotsman
gadolinia
genus sennas
gergon
get sth out
good natures
Harmonized Description Coding System
highwater marking
hirings
hot-bath quench aging
i was wondering
lame-ducks
laughed my ass off
liquid monomer plastic
maids
Manx cat
melanoderma toxica
Microzamia
modern cybernetics
mountain phlox
negative going
nonlead
octopodes
papillary epithelioma
perichareia
periodic merit rating
phenylmercuric hydroxide
place-brick
Placido's disk
PNID
polydystrophic
pyrometer lamp
radionavigation tailbuoy
robbo
rock craft
rossmen
scrapped vessel
scutle
secondary mouth
see no evil
severe burn
shaw
single-end user
slobbers
small particle contamination
smp (scanning microscope photometer)
son vertex
specialized capital goods
spywares
start-finish
Stoby
stream of people
sulfidize
sun yat - sen university
test ring
tetragnatha ceylonica
thermal conversion
thiazidelike
tonify the kidney to arrest spontaneous emission
toralizumab
tuberculosis of scrotum
tuberculous bacillemia
unemolumented
upper middle class
vitrics
Weston standard cadmium cell
what's your problem
wine-shipper