外研（新标准）版 八年级下 Module 3 Unit 2 We have not found life on any other planets yet. 课件 (共14张PPT)

(共14张PPT)
People have known only a little about the universe.
Let’s learn something about our universe.
What have you known about the universe
Have you ever talked about the universe with your friends
planet
satellite
It goes around the earth.
It can’t give off light, but it can reflect light.
The sun is a star. It can give off light and heat.
How many planets go around the sun
The earth goes around the sun, the seven other planets also go around it .
What are the sun and its eight planets called
Among the seven other planets, which planet has the same environment of that of earth
galaxy
There are many other solar systems in our galaxy.
solar system
Put the following in order of size from the smallest to the largest.
galaxy planet solar system star universe
3
2
1
3
4
5
planet
star
solar system
galaxy
universe
What questions do you have about our universe
Eg: How big is the universe
How old is the universe
Are we alone in space
Is there life out there in space
Have there been visitors to the earth from other planets
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Read the passage and choose the best title for it.
1. Anyone out there
2. Life on Earth
3. The sun and other stars
4. The stars at night
1.How long has life been on Earth
2.What is the Solar System
3.What is our Galaxy called
4. How many other stars are there in the Galaxy
3.Why haven’t we found life in the seven other planets in the Solar System
Reading
Para.1-2
There has been life on Earth for millions of years.
The Sun and its planets
Because none of them has an environment with air and life can not grow.
The Milky Way.
There are billions of stars.
Para1-2
Para3-4
1. Have scientists discovered only one galaxy in the universe
2. How far are the stars in other galaxies from us
No, they have discovered many other galaxies.
It takes the light from other galaxies many years to reach us.
They are many light years away from us.
Para 5-6
We have sent lots of spacecraft.
No, they haven’t.
1.What have we done to look at the other planets in our Solar System
2.Have any the spacecrafts travelled far enough to reach other stars in our galaxy
3. Read the passage and choose the best title
A. Anyone out there B. Life on Earth
C. Our solar system D. The stars at night
1. The Earth is a star.
2. The Sun is a star.
3. There is more than one galaxy.
4. The light from 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.
planet
haven’t
yet



haven’t
Read the passages carefully and check the true sentences.
Are we alone
Is there life out there in space
Talk abou your idea.