时间:2019-01-13 作者:英语课 分类:VOA标准英语2012年(六月)


英语课

 


NASA to Launch Black Hole Hunter



Black holes have a gravitational pull so intense that not even light can escape from them. As gas, dust and stars are sucked in, the material accelerates and heats up, generating powerful X-ray light emissions 1.


Only a few decades ago, scientists thought black holes were rare. But their thinking has changed in the past 20 years, and now NASA is setting out to conduct a census 2 of the black holes in the universe.


The U.S. space agency is launching a black hole hunter, a new telescope called NuSTAR, but formally known as Nuclear Spectroscopic Telescope Array.


Paul Hertz is the director of NASA's astrophysics division.


"Stars, nebulae and black holes emit X-rays of the type that we use in medical X-rays, and these cannot be detected from the surface of the Earth," explained Hertz. "But the NuSTAR telescope will focus these X-rays onto its digital camera and send the pictures back to Earth for scientific analysis."


Current telescopes provide images that show a general glow from hundreds of massive black holes. NASA expects NuSTAR will be able to provide far better images of black holes and other high-energy events when it surveys the extra-galactic sky.


The images will be studied by people around the world, including NuSTAR's principal investigator 3, Fiona Harrison.


"NuSTAR will open a whole new window on the universe, by being the very first telescope to focus on high-energy X-rays. As such, it will make images that are 10 times crisper and 100 times more sensitive than any telescope that is operated in this region of the spectrum," Harrison said. 


The NuSTAR telescope is about the size of a refrigerator, but it has a hidden tool. About a week after NuSTAR launches, it will deploy 4 a 10-meter mast that will separate its mirrors from its detectors 5. That mast provides the distance required to focus the X-ray light into sharp images. 


NASA scientists say that perhaps two out of every three black holes in the universe are hidden.


This telescope will be able to find these black holes behind their obscuring veils of dust and gas. It will also be able to tell how quickly a black hole is spinning, which will help scientists learn how black holes form.


"Like all of our NASA missions, we're going to find unexpected things out there that will lead us to questions and answers that we aren't even anticipating at this time," predicted NASA's Paul Hertz.


NASA says NuSTAR will start providing data to scientists about a month after its launch. 




排放物( emission的名词复数 ); 散发物(尤指气体)
  • Most scientists accept that climate change is linked to carbon emissions. 大多数科学家都相信气候变化与排放的含碳气体有关。
  • Dangerous emissions radiate from plutonium. 危险的辐射物从钚放散出来。
n.(官方的)人口调查,人口普查
  • A census of population is taken every ten years.人口普查每10年进行一次。
  • The census is taken one time every four years in our country.我国每四年一次人口普查。
n.研究者,调查者,审查者
  • He was a special investigator for the FBI.他是联邦调查局的特别调查员。
  • The investigator was able to deduce the crime and find the criminal.调查者能够推出犯罪过程并锁定罪犯。
v.(军)散开成战斗队形,布置,展开
  • The infantry began to deploy at dawn.步兵黎明时开始进入战斗位置。
  • The president said he had no intention of deploying ground troops.总统称并不打算部署地面部队。
探测器( detector的名词复数 )
  • The report advocated that all buildings be fitted with smoke detectors. 报告主张所有的建筑物都应安装烟火探测器。
  • This is heady wine for experimenters using these neutrino detectors. 对于使用中微子探测器的实验工作者,这是令人兴奋的美酒。 来自英汉非文学 - 科技
学英语单词
a-c bias
artificial transition
ascogenous
bacterial plant disease
be meat and drink for someone
be symptomatic of
bird-arm
bivariate function generator
breise
buttfuck
by-passage
cellulose film
chandly
choke up with
column with constant cross-section
control diode
corpsing
creep crack
cross-bred
cruising horse-power
crural sarcoma
CubeSat
curli
dalin
differential receiver statics
din-dins
dire
Draw Sample
eases up
ex-users
fresh infusion of senna
gaitas
George Sandism
golfingia margaritacea margaritacea
gravity segregation
independent sample design
indicator pressure
indirect gap semicondutor
infighting
interfacial angle
invoice outward
keeners
Kuznets cycle
laparocystectomy
Lummus cracking process
Maakel Region
mabrouk
Masubia
Mazak alloys
medium-temperature salt bath rectifier
milliken conductor
miracle cure
monocolous
Moral de Calatrava
nanoresistor
non-homing-type rotary switch
nuisance values
optical-discs
penicillium janczewskii
persistent pesticide
plagueful
plagueship
practical esthetics
prior equity
produce a play
programming language extension
quarterline
quickbreads
re-advances
recueil
regular-season
repairing base
resilient drive
retiered
retirement table
revhead
Rhodo phyceae
right-front
rigid-tine rotary cultivator
riparias riparias
sack tap
Salsola tragus
sericite in powder
sex-conditioned inheritance
sham eating
silk gauze
socket cover
solidago spathulatas
spare wire
spheric scale
stereoblastula
stream flow routing
superintendent engineer
swizzles
thermal denaturation
Troyish
trufan
type ahead
ubundu (ponthierville)
venae hypogastrica
Xenoantibodies
Zonabris