初二下外研版Module3Journeytospace》Unit2Wehavenotfoundlifeonanyotherplanetsyet.学案(.docx
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1、M3Journey to spaceUnit 2 we have not found life on any other planets yet.Pre-reading: revision of u1:Do you remember the latest news in unit1?While-readingScientists think that there has been life on the earth for hundreds of millions of years. However, we have not found life on any other planets ye
2、t.The earth is a planet and it goes around the sun. Seven other planets also goaround the sun, None ofthem has an environment like that of the earth, soscientists do not thinkthey will findlife on them. The sun and its planets arecalled the solar system, and our solar system is a small part of a muc
3、h larger group of stars and planets, called the Galaxy or the Milky Way. There are billions of stars in the Galaxy, and our sun is only one of them.Scientists have also discovered many other galaxies in the universe. They are very far away and their light has to travel many years to reach us. So how
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