Unit 5 Humans and Nature Viewing Workshop 课件-2023-2024学年高一英语北师大版（2019）必修第二册

Unit 5 Viewing Workshop How Big is the Universe? 新 课 导 入 Brainstorming When it comes to universe , what do you know about it? universe stars planets vastness infiniteness … … … … 课 堂 学 习 Activate and Share What do you know about the universe? Complete the quiz with the right numbers? 13.8 billion 93 billion 46 billion 1. The universe is about __________ years old. 2. The observable universe is about _________ light years across in diameter. 3. Today the distant objects like stars that we can observe are a bit more than ____________ light years away. 1 View and Learn Watch the first part of the video. Check your predictions from Activity 1. 2 13.8 billion 93 billion 46 billion 1. The universe is about __________ years old. 2. The observable universe is about _________ light years across in diameter. 3. Today the distant objects like stars that we can observe are a bit more than ____________ light years away. 13.8 billion 93 billion 46 billion Watch the rest of the video. Complete the table. 3 Questions Observable Universe Whole Universe 1. How big is it? 2. Is there an edge? 3. Is there a centre? 4. Is it getting bigger? The observable universe is about 93 billion light years across in diameter. Infinite. Yes. Temporal edge. No. Yes. Earth/You. No. Yes. Yes. Watch the whole video again. Discuss the questions. 4 1) What is the Earth compared to? Is the comparison useful in understanding the infiniteness of the universe? 2) What methods does the presenter use to enable viewers to understand this piece of knowledge in physics? The size of the Earth within the observable universe is roughly equivalent to the size of a virus within the solar system. That does not help much, because we cannot really appreciate the incomprehensible smallness of a virus nor the bewildering bigness of our solar system either. The presenter provides comparisons that are relative to our knowledge. Express Yourself 5 What have you learnt about the size of the universe? Find more inf