飞轮扫描地球敏感器

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(131) / 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(154) / 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(124) / 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(116) / 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(111) / 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(140) / 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(149) / 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(141) / 评论(0) 分类 火星生命

发表于:2018-12-10 / 阅读(154) / 评论(0) 分类 英语口语1+1

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(130) / 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(149) / 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(140) / 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(162) / 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(168) / 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(165) / 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(153) / 评论(0) 分类 火星生命

My infant daughter began crying as I drove home from the store, and since she was harnessed to her safety seat in the back, I couldn't console her. Stopping for a red light, I turned around and waved

发表于:2019-01-03 / 阅读(154) / 评论(0) 分类 英汉幽默故事选读

The wheel on the bus 在公共汽车上 The wheels on the bus go round and round round and round, round and round The wheels on the bus go round and round All through the town The people on the bus go up and down Up and down, up and down The people o

发表于:2019-01-03 / 阅读(184) / 评论(0) 分类 优美儿童英语歌曲

My infant daughter began crying as I drove home from the store, and since she was harnessed to her safety seat in the back, I couldn't console her. Stopping for a red light, I turned around and waved my hands, calling her name to distract her. I gave

发表于:2019-01-08 / 阅读(150) / 评论(0) 分类 趣味英语

spinning one's wheel re-inventing the wheel 在今天的节目里我们再来给大家讲解两个由轮子,也就是wheel这个字组成的习惯用语。我们已经学过:at the wheel,就是开车

发表于:2019-01-08 / 阅读(210) / 评论(0) 分类 美国习惯用语
学英语单词
AACOCF3
antipill
attractable
baking dry varnish
blazings
butter printer
calamusenone
calcite aegiapite
can-annular combustor
carberies
carriage examiner
chews the fat
cloth in rope form
coaxes
coloradoa rufomaculata
compilation plot
cosi
duplex control
dysjunction
Elatostema crenatum
electrically latched
emission spectrometry
ethylal
exciting bank
fall upon someone hammer and tongs
false nines
fructiculose
geographic ecology
get scared
Gnetophyta
Gone for a burton
Hattula
hay filter
highest in first out method
Huanchaco
huff-duff
hysterogenetic
illegal type of loop control variable
intravalvular
iodocholesterol scan
latoya
lay up warranty
lek paradox
leniency error
liskeardite
Lost Tribes
marsh deer
medium grain size
melanoides tuberculata formosensis
metamorphoscope
micro hardness tester
model speed
molluscivorous
Napiéolédougou
narrow-gate amplifier
new-brooming
nidates
non limiting
non-perception
not for a minute
OH (oil heater)
oiling chain
oithona robusta
operator register
optical simulation
periodmeter
phase transition under high pressure
Phaseolinae
Phasiidae
photic hyposensi-tiveness
planing tool carriage
plate condenser antenna
probability error rate
quasi-thermodynamic kinetics
ramverse
rated temperature category
rattail cord
relied on
restart sorting
right of fishing
road hog
San Juan Arriba
scorched ingot
semicommercial
slipshod
snoggable
Solanum tuberosum L.
spherical divergence
sport-confidence
square centimeters
syllabic alphabet
tax-gatherers
technoshamanic
threshold limit value place of work
tool rest
trailer ship
tunnel casting ring
underdefine
us hi
veryen
wanax
whaling stations