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Horizon - Life On Mars 火星生命 - 4

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

Horizon - Life On Mars 火星生命 - 2

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.

Horizon - Life On Mars 火星生命 - 1

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

Horizon - Life On Mars 火星生命 - 8

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

Horizon - Life On Mars 火星生命 - 7

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

Horizon - Life On Mars 火星生命 - 6

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

Horizon - Life On Mars 火星生命 - 5

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

美语听力 English Café 491

Topics: American Presidents-Rutherford B. Hayes; emission versus propagation; he/she don't; to do (someone's) bidding Words: slavery to oppose to secede to abolish to run for office to nominate rumor corrupt to uphold to interfere intention to be qua

Horizon - Life On Mars 火星生命 - 15

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

Horizon - Life On Mars 火星生命 - 14

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

Horizon - Life On Mars 火星生命 - 13

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

Horizon - Life On Mars 火星生命 - 12

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

Horizon - Life On Mars 火星生命 - 10

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

Horizon - Life On Mars 火星生命 - 9

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

Horizon - Life On Mars 火星生命 - 11

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'

11 Nations Sign Trans-Pacific Trade Deal Without US

Eleven countries in the Pacific region have signed a major Asia-Pacific free trade agreement in Santiago, Chile. The deal is a new version of the Trans-Pacific Partnership from which the U.S. withdrew last year. The agreement is called the Comprehens

WHO Wants to Remove Trans Fats from Food

From VOA Learning English, this is the Health Lifestyle report. There may be something in your food that you cannot see and cannot taste. But it could be killing you. It is an artificial oil commonly called trans fat. Trans fat is a toxic chemical th

Step by Step 3000 第1册 Unit7:Transporation(2)

Part 2. Green Transporation Festival. Keywords. Green Transporation Festival, oil, environment, reduce, other kinds of fuels. Vocabulary. hydrogen, propane, scooter, hybrid, ethanol. A. You are going to hear a report on green transporation festival.

National standard for trans fat labeling

BEIJING, Nov. 4 (Xinhuanet) -- The amount of trans fat and other nutritional information will be marked on the labels of prepackaged food, according to the country's first national standard for food nutrition. The labeling will take effect on Jan 1,