外研版八年级下英语课件 Module3 Unit 2 (PPT45张)

Module 3 Unit 2 We have not found life on any other planets yet. 没有一人；没有一个； 一点儿也没有 none n.环境 environment pron.那, 那个 solar adj.太阳的;与太阳有关的 n.系统；体系 that system 星系;（尤指）太阳系 solar system Words and expressions n. 群；组 group n. 星系 galaxy n.宇宙 light n. 光；光线；光亮 adj. 办不到的, 不可能的 universe impossible v. 联系；交流 communicate adv. 在远方 out Shenzhou-9 is a manned spaceship. 1 Work in pairs. Look at the picture and talk about what you know about Chinese spaceships. Reading and vocabulary Presentation When you read a passage with a title and pictures, think about the words you may find in the passage, and the questions you may want to ask before you start to read. Learning to learn 2 Read the passage and choose the best title for it. Anyone out there? Life on the earth 3. The sun and other stars 4. The stars at night ________________________________ Scientists 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 yet. 1. Anyone out there? The earth is a planet and it goes around the sun. Seven other planets also go around the sun. None of them has an environment like that of the earth, so scientists do not think they will find life on them. The sun and its planets are called the solar system, and our solar system is a small part of a much 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 for many years to reach us. So how large is the universe? It is impossible to imagine. Scientists have sent spaceships to the planet Mars to take photos. They have even sent spaceships to travel outside the solar system. However, no spaceship has travelled far enough to reach other stars in our Galaxy. Scientists have always asked the questi