时间:2019-01-02 作者:英语课 分类:60秒科学


英语课

Water Blankets Forming Planets

A study in the journal Science finds much more molecular 1 water in regions where planets are forming around young stars. The mechanism 2 to keep the water from being destroyed by UV radiation appears to involve some of the water molecules 3 shielding the rest. Cynthia Graber reports


In 2008 astronomers 4 discovered surprising amounts of water molecules where planets were forming near young stars. But how, they wondered, could those molecules survive? They should have been destroyed by ultraviolet radiation. In theory, planetary dust could block out UV rays, but the dust was bound up in the creation of those young planets. So what's protecting the water? Now researchers at the University of Michigan believe they have the answer, which they published in the December 18th edition of the journal Science.


The regions where planets are being created are incredibly chemically productive, rapidly generating new compounds. According to the researchers, some water molecules surround the almost-planet dust and act as almost a sacrificial layer. The water molecules absorb the ultraviolet rays—and, though those molecules are destroyed, the embryonic 5 planet is shielded. And the region is producing water faster than the protective layer is being destroyed.


The scientists say this action is similar to our ozone 6 layer, which blankets us with protective shielding from UV radiation. They tested this idea in computer models and found that the results mirrored the observations. Seems that having water when a planet’s finished requires sacrificing some in the process.

 



adj.分子的;克分子的
  • The research will provide direct insight into molecular mechanisms.这项研究将使人能够直接地了解分子的机理。
  • For the pressure to become zero, molecular bombardment must cease.当压强趋近于零时,分子的碰撞就停止了。
n.机械装置;机构,结构
  • The bones and muscles are parts of the mechanism of the body.骨骼和肌肉是人体的组成部件。
  • The mechanism of the machine is very complicated.这台机器的结构是非常复杂的。
分子( molecule的名词复数 )
  • The structure of molecules can be seen under an electron microscope. 分子的结构可在电子显微镜下观察到。
  • Inside the reactor the large molecules are cracked into smaller molecules. 在反应堆里,大分子裂变为小分子。
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》
adj.胚胎的
  • It is still in an embryonic stage.它还处于萌芽阶段。
  • The plan,as yet,only exists in embryonic form.这个计划迄今为止还只是在酝酿之中。
n.臭氧,新鲜空气
  • The ozone layer is a protective layer around the planet Earth.臭氧层是地球的保护层。
  • The capacity of ozone can adjust according of requirement.臭氧的产量可根据需要或调节。
标签: 60秒科学 Blanket
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absidia corymbifera
acidic jet
air dried coal
aliplast
alond
anti-individualist
as scheduled
az zafiri
bakestone
batch production process
benaxibine
BII Finance Company Limited
block salt
C instruments
cacochymious
calf feeder
calking weld
Camellia liberistyla
cecal appendage
celant
channel switcher
column on elastic foundation
crossclaimed
cyanformic acid
decerned
deferred experimental and research expenses
double-pole single-throw switch
ear doctor
encephalomata
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expiration-inspiration(ratio)
externally heated oven
extraneous estimate
fibrae arcuatae externae dorsales
flying a kite
gate turn on
gaun
ghost relic
goulash communism
hacking knife
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ironmaking furnace
j'en
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littlein
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macrocall numeric argument
Manhattan
manthei
massa innominata
Mercaptovaline
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minituner
mountain region farming
multi stage centrifugal pump
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Naxcivan
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ornatus
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paramonacanthus nipponensis
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plethobasus cooperianus
polyvinyl jacketed (cable)
poopa
positive psychology
primary perineum
rappini
recompounding
run-off plate
runtime storage administration
sectarist
share scrip
short cause
Sporting-dog
spray shield
spur canal
subsequent document
surn
tele indicating system
to burn the candle at both ends
ultrasonic testing (ut)
unextinguished discount on funded debt
wall drag
why in the world
world of industry and commerce
yassen
yulan magnolia