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神秘的
Go to explore it.
The world will be different!
3
Unit 2 We have not found life on any other planets yet.
1.To remember key words & useful expressions:
environment / group / galaxy / universe / light / impossible / communicate
none of / far away / communicate with
It is impossible to imagine.
It goes around the sun.
2.To be able to get more about space through reading.
learning aims of M3 U2:
接龙
幻灯片上单词或短语出现时，同学应迅速读出并说出中文意思。
每人一词，按行/列依次接龙，3秒内说不出，此行/列同学即失去此答题机会，下一行/列同学接续。
Read Para 1 & 2 and discuss:
According to(根据) the scientists, how long has life been on Earth?
2. Why can’t people and other things grow on other planets ?
3. What is called the solar system ?
4. What’s the relationship(关系) between the solar system and our galaxy?
For millions of years.
Because none of the planets has an environment like that of the earth.
The Sun and its planets.
The solar system is a small part of our galaxy.
The distance（距离） from the other galaxies to the Earth:
The size(大小) of the universe:
It’s impossible to imagine.
Read Para 3 and fill in the form:
Their light has travelled for
many years to reach us.