M3U2（6分钟）

Unit 2  We have not found life on any other planets yet.

1.Scientists think that there has been life on earth for hundreds of millions of years.

2.However, we have not found life on any other planets yet.  

3.The earth is a planet and it goes around the sun.

4.Seven other planets also go around the sun.

5.None of them has an environment like that of the earth, so scientists do not think they will find life on them.

6.The sun and its planets are called the solar system, and our solar system is a small part of a much larger group of stars and planets, called the Galaxy or the Milky Way.

7.There are billions of stars in the Galaxy, and our sun is only one of them.  

8.Scientists have also discovered many other galaxies in the universe.

9.They are very far away and their light has to travel for many years to reach us.

10.So how large is the universe?

11.It is impossible to imagine.  

12.Scientists have sent spaceships to the plant of Mars to take photos.

13.They even have sent spaceships to travel outside the solar system.

14.However, no spaceship has travelled far enough to reach near other stars in our Galaxy.

15.Scientists have always asked the question: With so many stars in the universe, are we alone, or is there life out there in space?

16.Have there been visitors to the earth from other planets?

17.Why has no one communicated with us?

18.We do not know the answers…yet.   

Questions:  

1. Have we found life on any other planets?  

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2. How many planets are there going around the sun?  

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3. Why don’t the scientists think they will find life on the other planets?  

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4. What’s the Milky Way?

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Keys:  

1. No, we haven’t.  

2. Eight.  

3. None of them has an environment like that of the earth, so scientists do not think they will find life on them.    

4. The sun and its planets are called the solar system, and our solar system is a small part of a much larger group of stars and planets, called the Galaxy or the Milky Way.

生词表：

found发现（find过去分词）

life生命

planets行星

yet还，尚未

1. scientists科学家（复数）

think认为

on earth在地球上

hundreds of millions亿万

2. however然而

other 其他的

planets行星

earth地球

planet行星

goes around围绕

3. sun太阳

4. planets行星

5. none没有

environment环境

scientists科学家

6. are called被称为（被动语态）

solar system太阳系

group组，群

stars恒星

Galaxy 星系，银河系

the Milky Way银河系

7. billions of十亿

stars恒星 

Galaxy银河系

8. scientists科学家

discovered发现

galaxies星系

universe宇宙

9. light光线

reach到达

10. large 大

universe宇宙

11.  impossible不可能的 

imagine想象

12.  scientists 科学家

 sent 发送

spaceships 宇宙飞船

 plant计划

 Mars 火星

take photos拍照

13. even甚至

spaceships 宇宙飞船

 travel 旅行

outside在…外面 

solar system太阳系

14. spaceship宇宙飞船

enough足够的

reach到达

stars恒星

Galaxy银河系

15. question问题

universe宇宙

alone孤独的

life生命

space太空

16. visitors拜访者

other 其他的

planets星球

17. communicated交流，联系

18. answers答案

汉语译文

第二单元 我们还没有在其他行星上发现生命

1.科学家认为地球上有生命已经有数亿年了。

2.然而，我们还没有在其他行星上发现生命。

3.地球是一个行星，绕着太阳转。

4.其他七颗行星也绕着太阳转。

5.它们都没有地球那样的环境，所以科学家认为它们不会在上面找到生命。

6.太阳及其行星被称为太阳系，而我们的太阳系是一个更大的恒星和行星群的一小部分，称为银河系或银河系。

7.银河系中有数十亿颗恒星，我们的太阳只是其中的一席。

8.科学家们也发现了宇宙中的许多其他星系。

9.它们离我们很远，它们的光要经过很多年才能到达我们这里。

10.那么宇宙有多大？

11.这是不可能想象的。

12.科学家们已经派宇宙飞船到火星拍照。

13.他们甚至派出宇宙飞船到太阳系外旅行。

14.然而，没有一艘宇宙飞船能飞得足够远，接近我们银河系中的其他恒星。

15.科学家们总是问这样一个问题：宇宙中有这么多恒星，我们是孤独的，还是太空中有生命？

16.有没有其他星球的访客到地球来？

17..为什么没有人和我们交流？

18.我们还不知道答案。