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

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

Astronaut  ['æstrənɔːt] 宇航员

Spaceship 宇宙飞船

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

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

Comet 彗星 ['kɒmɪt]

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

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

Black holes 黑洞

Satellite 人造卫星 ['sætəlaɪt]

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

Do you know how our life began on the earth?

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

In Chinese culture… 　　　　made human beings. Nvwa

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

Scientists:The Big Bang Theory

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

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

water Plants on land Plants in the water Shellfish and fish

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

humans came into being and spread all over the world.

Para. 1 A. The formation (形成) of the earth. Para. 2 B. The importance of water for life. Para. 3 C. A widely accepted theory about the formation of the universe. Para. 4 D. The arrival of humans and their impact on the earth. Para. 5 E. The development of plants and animals on the earth.

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

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

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

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

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

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

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

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

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

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

Thank you!