超视距通信;散射传播

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(74) / 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(100) / 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(73) / 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(62) / 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(67) / 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(79) / 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(88) / 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(94) / 评论(0) 分类 火星生命

Callum: Hello, today in Talk about English we have the fifth programme in our series on culture and communication. Today Marc Beeby looks at the topic of non-verbal communication communication without language. People from different cultures speak d

发表于:2018-12-11 / 阅读(94) / 评论(0) 分类 英语讨论

'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(63) / 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(82) / 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(105) / 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(90) / 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(107) / 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(103) / 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(105) / 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(98) / 评论(0) 分类 火星生命

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(71) / 评论(0) 分类 2018年NPR美国国家公共电台4月

The Cardigans-Communication For 27 years I've been trying to believe and confide in different people I found Some of them got closer than others and some wouldn't even bother and then you came around I didn't really know what to call you You didn't

发表于:2019-01-19 / 阅读(162) / 评论(0) 分类 音乐咖啡厅

XICHANG, Sichuan, June 21 (Xinhua) -- China successfully launched a new communication satellite, the Zhongxing-10, from its Xichang Satellite Launch Center in southwest Sichuan Province on early Tuesday. The satellite, carried by a Long March-3B rock

发表于:2019-02-07 / 阅读(88) / 评论(0) 分类 英语新闻
学英语单词
Alliance Party of Northern Ireland
appoint and dismiss
ash hoist
athletic types
batch input
bill jobber
blind drilling
block matching motion compensation
body-mike
bolt oil
C programming
calfed
checkarsey
class Actinozoa
condition event system
corporation sole
Cromal
cross-reference report
cumulative average
Darlington phototransistor
decontaminability
defector-cope
ditrigonal scalenohedral class
doctrinist
double-dating
dun-coloureds
elevation of water surface
espanola
euglenozoa
exploratory data analysis
exultive
failure to perform
financial supervisor
for'd
gradient elution device
high fidelity processing
high-waisted
horizontal discharge tube
hot-cold hemelysin
immunotransfusion
independent observation
indicator control unit
inner time
invention and creation
invisible
ispahan rug
Kota Tinggi
lack of lactation
lateral ground bundle
lattice network
lie-abed
linguiensis
little old
lucicutia macrocera
main cold store
martspaine
marvelers
mentals
micropore filter
minisode
misri
national verification
neuroadaptations
nonpatients
nonsusceptible
nucleotherapy
occysion
one price
pancreatic notch
parthenogenone (beatty 1957)
pastoral prayer
pedal thrasher
pelobatidaes
petroleum berth
phoebes
plait pitch
polyacrylate rubber
projectile loom
protection by paints and lacquers
public health care
quadratus
quantum theory of gravity
rectangular system of city planning
retaining spring
rodiers
sindall
sinking feelings
stable vertical
stainings
Stemona tuberosa
strepsipteron
stub bar
studuous
sub partners
test monitor
trebetherick
twine holder disk
volume of geosar traffic
washes over
weisman
well-thoughts
zonotopes