高中英语北师大版（2019新版）必修第二册 Unit 5 Humans And Nature Viewing Workshop 课件（共46张PPT）.ppt

1、 Viewing Workshop How Big is the Universe? How Big is the Universe? Brainstorming stars galaxy solar system black holes planets When it comes to universe, what do you know about it? infinite UNIVERSE vast huge / giant How Big is the Universe? Quiz about the universe. Complete the quiz with the right

2、 numbers. 13.8 billion 27.5 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. diameter 直径 Watch the first part of the video.

3、Check your predictions from Activity 1. View and learn This video provides the answer to the frequently-asked question about the universe. How big is the universe? 13.8 billion 27.5 billion 46 billion 13.8 billion 1. The universe is about _ years old. View and learn More specifically, the observable

4、 universe is the region of space visible to us from Earth. And since the universe is only about 13.8 billion years old that can be seen or noticed in a detailed and exact way View and learn , then regardless of what direction we look, we see light that has been travelling at most 13.8 billion years,

5、 so it is logical to think of the observable universe must then be two times 13.77 equals 27.5 billion light years across. to be the same in size, quantity or value paying no attention even if there are difficulties View and learn 13.8 billion 27.5 billion 46 billion 93 billion 2. The observable uni

6、verse is about _ light years across in diameter. View and learn But it is not. That is because over time, space has been expanding, so the distant objects that gave off that light 13.8 billion years ago have since moved even farther away from us. View and learn to become larger or greater Today thos

7、e distant objects are a bit more than 46 billion light years away. Multiply times two and you get 93 billion light years一the diameter of the observable universe. 2 multiplied by 4 is 8. ( 2X4=8 ) View and learn 13.8 billion 27.5 billion 46 billion 46 billion View and learn 3. Today the distant objec

8、ts like stars that we can observe are a bit more than _ light years away. Watch the rest of the video. Complete the table. View and learn Observable Universe Whole Universe 1. How big is it? 2. Is there an edge? 3. Is there a center? 4. Is it getting bigger? Questions Watch the video again. Complete

9、 the table. View and learn Observable Universe Whole Universe Questions 1. How big is it? About 93 billion light years across in diameter. Infinite. View and learn , the size of the Earth within the observable universe is roughly equivalent to the size of a virus within the solar system. equal in va

10、lue, amount, meaning or importance View and learn 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. very confusing and difficult to understand difficult or impossible to understand View and l

11、earn So lets just say that the observable universe is stupendously big. But the whole universe, as far as we can tell, is a lot bigger. Space is most likely infinite, or at least it doesnt have an edge. having no limit, end or edge surprisingly impressive or large View and learn the observable unive

12、rse is currently 93 billion light years across. The whole universe is probably infinite. View and learn Questions 2. Is there an edge? Yes. No. Observable Universe Whole Universe View and learn The observable universe does. , and the whole universe has a temporal edge or what we call a beginning, bu

13、t almost certainly not a spatial one. being used to describe things relating to areas connected with or limited by time View and learn Questions 3. Is there a center? Yes. Earth / You. No. View and learn Observable Universe Whole Universe The observable universe has a center us. We are at the center

14、 of the observable universe because the observable universe is just a region of space visible from Earth. Again, the observable universe does you! The universe as a whole almost certainly not. View and learn In fact, if you want to be more precise, each one of us is the center of our own observable

15、universe, but that does not mean we are at the center of the whole universe. exact and accurate View and learn Questions 4. Is it getting bigger? Yes. Yes. Observable Universe Whole Universe View and learn Yes, space is expanding, which makes both the observable universe and the whole universe bigge

16、r. View and learn Pair Work Watch the whole video. Discuss the questions. 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? Pair Work

17、 1. What is the Earth compared to? Is the comparison useful in understanding the infiniteness of the universe? Pair Work 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 apprec

18、iate the incomprehensible smallness of a virus nor the bewildering bigness of our solar system either. Pair Work 2. What methods does the presenter use to enable viewers to understand this piece of knowledge in physics? Pair Work The presenter provides comparisons that are relative to our knowledge.

19、 Pair Work What have you learnt about the size of the universe? Find more information online and share with the class. Express Yourself 1. The universe is huge. Express Yourself 2. The observable universe is about 93 billion light years across in diameter. 3. The observable universe has a center. 4.

20、 Space has been expanding. Express Yourself 5. In the observable universe, the earth is roughly the size of a virus in the solar system. 6. Both the observable universe and the whole universe are becoming bigger. 7. The observable universe has an edge. Express Yourself Find more information about the universe online and share with the class. Homework