第72期：Is there life on Mars?

THE National Geographic CHANNEL analyzes the data of the foremost minds in planetary science, as well as amateur 'researchers' who have dedicated their lives to finding the answer to their question: Is there life on Mars?

参与方式：

1、给听写挑错。没有听出来的和不确定的地方我都会红色标注，当然没有标出来的地方也会有错，请大家仔细的听哦。挑错成功有奖：）

2、听写材料中空缺的单词（100HY）[可能是单个或多个单词, 也可能是句子]

Believe it or not, astrobiologist Penny Boston is searching for life on Mars by dropping deep into this heart of darkness. This is a___1___. A subterranean cave formed by underground lava flows during volcanic eruptions that occurred thousands of years ago. And Boston has someone she wants us to meet.

Sometimes, they’re in prefaces, sometimes they’re kinda hard to see.

Is this one the scary monster to reveal as itself? Ah, there’s one. Actually, no. This, is an extremophile. We are looking for what we astrobiologists call extremophiles in this environment, that means that they are organisms that are living in very difficult conditions. In this particular case, these organisms are living in very cold cave, right around, freezing, they are making their living without benefit of sunlight and there is almost nothing to eat in this cave. In recent years, scientists have discovered _____2_____ living in all forms of extreme environments. So, if on earth, why not on Mars?

We think that Mars is covered with lava tubes, we believe that by looking at organisms that live in these extreme circumstances on earth, we can learn a lot about what to look for on Mars. And that, similar ____3____may be able to persist on Mars in places very similar to this lava tube.

To find out, Dr. Boston has created her own little Mars _____4_____. Essentially exposing ______5______to various elements to be expected on Mars.

They have been subjected to Mars-like levels of high_____6_____, and Mars like temperature cycles. We have given them atmospheric compositions from very low levels of carbon dioxide with nothing else, to perhaps 1/10 the density of earth’s atmosphere, and tested them under those conditions.

And so far, she’s isolated 36 different ___7___of organism that ___8___quite happily. So in theory at least, life could survive the harsh conditions of Mars except for one problem.

There is one thing for sure that we know, and that is that all forms of life on our planet require liquid water. We don’t know if that’s going to be true on other planets, but we think that where there is going to be life, there is going to have to be water.

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