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Conditions on Mars were so harsh that it was hard to imagine any life surviving there. The idea of sophisticated aliens was wiped out. We know that conditions on Mars today are not very good for life.

发表于:2018-12-07 / 阅读(116) / 评论(0) 分类 火星生命

These discoveries raised the stakes. Here was a planet similar to our own. Mars might not have cities or civilizations. But it could be home to other smaller life forms like microbes. Chris McKay is N

发表于:2018-12-07 / 阅读(146) / 评论(0) 分类 火星生命

I think it is exciting. Because it would imply that if life arose independently on Mars. The implication is that life is pervasive throughout the universe. This is why Mars has so obsessed scientists.

发表于:2018-12-07 / 阅读(114) / 评论(0) 分类 火星生命

In 2001 a new NASA probe was launched. Called Odyssey, it was sent to Mars to carry out the most detailed analysis ever of the planet’s surface. What it has discovered may be about to answer one of

发表于:2018-12-07 / 阅读(107) / 评论(0) 分类 火星生命

But even if there had been water, life doesn't start overnight. Even a simple microbe is the product of complex chemical systems that take millions of years to evolve. Had the water lasted long enough

发表于:2018-12-07 / 阅读(101) / 评论(0) 分类 火星生命

Rice had seen the same thing in Iceland, one of the few places on Earth with similarities to Mars. It too is extremely cold, and most of the water is frozen into glaciers. And also like Mars, buried u

发表于:2018-12-07 / 阅读(125) / 评论(0) 分类 火星生命

For Mars to have rivers, it must once have had streams, rain, clouds and an atmosphere, a planet just like the Earth today-if these were rivers. They had to be sure. The answers would come in 1998 wit

发表于:2018-12-07 / 阅读(130) / 评论(0) 分类 火星生命

William Boynton is professor of planetary sciences at the University of Arizona. And he's dedicated his life to looking for water on Mars. The link between life and water is very strong. Even here in

发表于:2018-12-07 / 阅读(131) / 评论(0) 分类 火星生命

'Deepwater Horizon' Honors The Sacrifice Without Sacrificing The Action play pause stop mute unmute max volume 00:0003:02repeat repeat off Update Required To play the media you will need to either update your browser to a recent version or update you

发表于:2018-12-18 / 阅读(99) / 评论(0) 分类 2016年NPR美国国家公共电台10月

Of course, any terraforming is still a long way off. The next few expeditions to Mars will definitely be made by machines. NASA, are sending 2 rovers, capable of travelling over 100 meters a day in se

发表于:2019-01-02 / 阅读(116) / 评论(0) 分类 火星生命

Well, hearing that Odyssey had found subsurface water on Mars was enormously exciting for somebody who is involved in planning to send humans to Mars. Water has a number of important uses for us. At t

发表于:2019-01-02 / 阅读(137) / 评论(0) 分类 火星生命

Life on Earth is basically proteins and DNA, so we can wonder if there is life on Mars will also be DNA and proteins, the same type of DNA, the same type of proteins. One might think that DNA is such

发表于:2019-01-02 / 阅读(129) / 评论(0) 分类 火星生命

But there was something even better. Odyssey may not just have found ice. There may also be liquid water, and that means, there could be living creatures there too. Right now, there might be liquid wa

发表于:2019-01-02 / 阅读(145) / 评论(0) 分类 火星生命

But they never got there. The first disappeared into deep space. Another missed its target when its coordinates were confused. One NASA control center was working in metric, the other in feet and inch

发表于:2019-01-02 / 阅读(151) / 评论(0) 分类 火星生命

The ground here is permafrost, a mixture of soil and ice frozen together. A group of Russian scientists have teamed up with NASA to drill down into it in search of microorganisms. It's work that's bee

发表于:2019-01-02 / 阅读(152) / 评论(0) 分类 火星生命

One of these wavelengths corresponds to hydrogen, another wavelength would be iron. Another wavelength would be oxygen. And so you go to the part of the spectrum you are interested in and you see you'

发表于:2019-01-02 / 阅读(137) / 评论(0) 分类 火星生命

AUDIE CORNISH, HOST: Before he became a film critic, NPR's Bob Mondello worked for a chain of movie theaters. He spent a lot of time in projection booths, which is where he's taking us this week as part of the NPR series Backstage Pass. It's been a w

发表于:2019-01-16 / 阅读(120) / 评论(0) 分类 2017年NPR美国国家公共电台7月

RACHEL MARTIN, HOST: Eight years ago today, an explosion on the Deepwater Horizon drilling rig killed 11 people and led to a massive oil spill in the Gulf of Mexico. The accident prompted big changes in how the country regulates offshore drilling. No

发表于:2019-01-16 / 阅读(130) / 评论(0) 分类 2018年NPR美国国家公共电台4月

今天我们要学的词是 extended。Extended 是形容词,延长的,长期的。He has been on extended sick leave since this summer. 他因为生病,从今年夏天就开始休长假。圣诞节前,Many retail stores are offering extended

发表于:2019-02-05 / 阅读(105) / 评论(0) 分类 英语单词荟萃

The ceasefire in the northern Syrian city of Aleppo that was due to expire last night has been extended by 48 hours. The extension comes after nearly 300 deaths in the city since the end of last month. Increased violence wrecked the 10-week-old parti

发表于:2019-02-18 / 阅读(137) / 评论(0) 分类 cctv9英语新闻2016年
学英语单词
AAE (American Association of Engineers)
altermaria calendulae yamamoto
ampelovirus pineapple mealybug wilt-associated virus
Araucaria cunninghamia
at one
automatic gain selection circuit
autoreinfection
banding conveyer
bind-corn
break seals
Chirita lunglinensis
cladosporium roesteri cattaneo
clipsi
component video recording
contract for difference
coordinator routine
copy modification
Council of Vienne
critical diagram
cultural detail
cyan(ogen) bromide
Dhu al-Hijjah
elasticity of substitution
erythrocyte sedimentation reaction
exstimulatory
family Bruchidae
file indirect
filicinus
Fischer iron-refining process
float plane
focus-puller
fuel system icing inhibitor
furcella
g?del numbering
genus sarcophagas
GM_any-more-or-anymore
gradation of moisture
half-joking
heitiki
high voltage transformer
hinged manhole
honorary chairman
horizontal distribution of erosion
jument
Kabutarang
KPCs
landing craft amphibious assignment table
lateral locator
left-luggage office
legal thought
legislative subjects
length controller
ligh fog
logical link
loop cutting machine
mini-marathons
minimal basis
monkey-faced owls
multiple domain
multiple stepped cone
muscle biopsy
naderites
national bonds
neuberger
noncentrally
optional trim package
pancreaticus sphincter
paramaxes
partially self-checking circuit
periprostatic
photoelectric switch
pipebridge
plagiogrammoid
Plagiopetalum
plan of land utilizaton
Platte River penstemon
precision distance measurement
propine
quadrilateral peristyle
rough topography
salad plants
saltwater lake
sausage machine
self-irrigation
servette
settle valve
sheir
solvent-sensitive adhesive
speed controller signal
spheno-frontal suture
spin-spin coupling
standard strength
stream trenching
suit yourselves
Sulfanilthiocarbamid
swim like a brick
sym-triazine
tuberculosus
tursiop
undifferentiated lymphoma
valid argument
variation of the mean error