1. The Science of the Stars
Unit 4 Astronomy:
The Science of the Stars

2. Astronomy（天文学） is the scientific study of the universe(宇宙) and the heaven bodies (such as the sun, the moon, and stars), gas, and dust within it.
Astronomer
天文学家

3. Astronaut
 ['æstrənɔːt]
宇航员

4. Spaceship
宇宙飞船

5. HOW LIFE BEGAN ON THE EARTH?
Pre-reading questions:
Where?
Why?
How?

6. Planet 行星 火星 Mars 金星 Venus 地球 Earth 天王星 Uranus 木星 Jupiter 土星 Saturn水星
Mercury
天王星
Uranus 木星
Jupiter 土星
Saturn
Planet 行星
海王星
Neptune

7. Comet 彗星
['kɒmɪt]

8. The Solar system 太阳系 eight planets 八大行星 many comets大量彗星
other objects 其他物质

9. The Milky Way 银河
庞大的盘状恒星集团，直径达120万光年，包含1000亿颗恒星。 9 9

10. Black holes 黑洞

11. Satellite 人造卫星
['sætəlaɪt]

12. Why the earth is different from other planets?
Because there’s life in it.

13. Do you know how our life began on the earth?

14. In Chinese culture…
sky
earth
Pangu
　separates the sky from the earth.

15. In Chinese culture…
　　　　made human beings.
Nvwa

16. In western countries:
created the world and all living things.
God

17. Scientists:The Big Bang Theory

18. Step1： Listen to the tape and find out the key words of each paragraph

20. Big Bang
A cloud of dust
A solid globe
The earth
water
Atmosphere

22. water
Plants on land
Plants in the water
Shellfish and fish

24. Insects and amphibians(两栖动物）
Reptiles（爬行动物 ）
Dinosaurs（恐龙）
Mammals （哺乳动物）

25. humans came into being and spread all over the world.

26. Para. 1 A. The formation (形成) of
the earth.
Para B. The importance of water for
life.
Para C. A widely accepted theory
about the formation of the
universe.
Para D. The arrival of humans and
their impact on the earth.
Para E. The development of plants
and animals on the earth.

27. Step2: careful reading Fill in the blanks with correct words Time
What happened
Big Bang
______ began to form and
combine to create stars
and other bodies.
Atoms

28. Between 4.5 and 3.8 billion years ago
● Dust settled into a solid and ______ globe.
● The earth exploded to produce its ___________.
● The continued ________ of water allowed the earth to dissolve harmful gases and _____ into the oceans and seas.
violent
atmosphere
presence
acids

29. Many millions of years later
● The first small plants on the surface of the water produced _______.
● Early ________ and all sorts of fish appeared.
● Green plants began to grow on land.
● Insects and ___________ appeared.
oxygen
shellfish
amphibians

30. Many millions of years later
● ________ appeared and they laid eggs.
● Dinosaurs developed, laid eggs and _______ for more than 140 million years.
● Mammals rose and ____________ babies.
Reptiles
existed
gave birth to

31. About 2.6 million years ago
● Some small ______ animals with hands and feet appeared and spread all over the earth.
Now
Humans produce too much carbon _______, making the earth too hot.
clever
dioxide

32. life animals Plants Shellfish and all sorts of fish
Small plants in the water 1
Insects on land
Green plants on land
Amphibian on land and in water 2 1
Reptiles on land
forests 2
Dinosaurs on land 3
Mammals on land

33. Step3: summary
After the “Big Bang”, the earth was just a cloud of dust. It exploded with fire and rock, which _______ produced all kinds of gases and formed the earth’s___________.As the earth ____________, water began to appear on its surface. That made it possible for life develop. Later small plants began to grow. They ___________and filled the oceans and seas, which encouraged the______________
in time
atmosphere
cooled down
multiplied
development

34. of early shellfish and all sorts of fish
of early shellfish and all sorts of fish. Later small plants appeared on land, followed by land animals, when __________ disappeared, mammals became very important. They gave _________ to their babies. Now small clever animals _______ all over the earth. But they are not taking care of earth, the earth become ______ hot for the lives to live on, because they are putting too much carbon dioxide, which _______ heat __________ escaping from earth into space. Whether life will continue will _________ whether this problem can be solved.
dinosaurs
birth
spread
too
prevents
from
depend on

35. Step4: Speaking—find a planet(寻找宜居星球）
What kind of planet would you like to go?

36. Homework (1) Write an essay about how to save our earth.
(2)《优化探究》P57--60

37. Thank you!