外研版八年级英语下册《We have not found life on any other planets yet》journey to space PPT教学课件，共44页。
Review
Scientists have sent spaceship to Mars. The journey has taken several months.
Astronauts have already been to the moon.
No one has been to Mars yet, because Mars is very far away, much farther than the moon.
Presentation
Scientists think that there has been life on the Earth for hundreds of millions of years. However, we have not found life on any other plants yet.
Seven other planets also go around the sun. None of them has an environment like that of the earth, so scientists do not think they will find life on them.
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.
Work in pairs
Look at the picture and talk about what you know about Chinese spaceships.
Shenzhou-9 is a manned spaceship.
Check (√) the true sentences.
1. The earth is a star.
2. The sun is a star.
3. There is more than one galaxy in the universe.
4. The light from the stars in other galaxies has travelled for a long time to reach us.
5. Scientists have received many messages from space.
6. Spaceships have visited most of the universe.
Language points
1. Scientists think that there has been life on the Earth for hundreds of millions of years.
科学家认为地球上的生命已经有亿万年了。
millions of 数百万 hundreds of 数百 thousands of 成千上万 billions of 数十亿
2. However, we have not found life on any other planets yet.
然而，我们还没有在任何其他行星上发现生命。
3. None of them has an environment like that of the earth, so scientists do not think they will find life on them.
他们中没有一个有像地球这样的环境，因此科学家们认为在他们上面找不到生命。
none of … 表示（三个以上）一个也没有。做主语时，谓语动词可用单数或复数。
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