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
a narrow shave
actinopraxis
aircraft-mounted mine detector
al-daour
albedometers
amphicreatine
aptitude for
arched false work
armed reconnaissance
asahikawas
asphalt flooring
ataerio of drupelets
averill
bachet
bangs-bangs-bangs
be on leave
biological decomposition
blood sucker
busca
cauliflory
central frequency
coastal navigational warnings
coiler pulpit
cold mirrors
continuous charging
convergent filtration
counting on
cupr
delay sweep
dorkish
drum-kits
economy of scope
elbel
electric fog horn
errorlevel
fall of snow
filiforme
fillmass chute
first of same tenor and bate being unpaid
graphic-mode display
Gynutoclinus
high frequency thin film thickness meter
high temperature ablative material
Highmore's body
hochstein
hot gas flame
intermediate products
Koebe function
laterobronchus
liquid-pressure scales
log arithmic diode
losings
Mackinaw City
mean lead
Morciano di Romagna
Morus mongolica
Moszczenica
mucousness
non-delivery
nonahedrons
Ocarina of Time
ocean data acquisition system
oiltight bulkhead
orangethorpe
orthotopic small intestine transplantation
pericontinental area
pile weave
polemist
policy
polyxylic
port block
prehypertrophic
pro-Zionist
production speed
project engineer scheduling technique
Pseudoracelopus
pur.
raise foreign funds
reconceptualise
refrigerator mom
relative byte address
rod bipoiars
rolled sheet iron
scapuloanterior
seal (contact) face
separable acf
sexduction
sightreaders
site model
stooker
tariff kilometerage
tayloria indica
tegminal
transperineal
Tridax
ultra-distance
urban-cowboy
weak signals
winter-annual cover crops
work-lines
wound rotor series resistor starting
zoster frontalis