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

Unit 5 HUMANS AND NATURE HOW BIG IS THE UNIVERSE? To read and talk about the universe To view for understanding To summarise information UNIVERSE stars When it comes to universe, what do you know about it? galaxy solar system black holes planets infinite vast huge / giant How big is the universe? This video provides the answer to the frequently-asked question about the universe. Probably, these words from the video are new to you. Guess their meanings. Have a try. relating to or intended for one particular type of person or thing only paying no attention to sth./sb. to time a number, to increase by a large amount a straight line from one side of a circle to the other side, passing through the centre specifically regardless of multiply diameter surprisingly impressive or large without limits having the same value, purpose, job etc as a person or thing of a different kind difficult or impossible to understand equivalent incomprehensible bewildering stupendous infinite confusing, especially because there are too many choices or things What do you know about the universe? Complete the quiz with the right numbers. 13.8 billion 27.5 billion 46 billion 1. The universe is about ____________ years old. 13.8 billion 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. 93 billion 46 billion Watch the first part of the video. Check your predictions from Activity 1. Watch the rest of the video. Complete the table. 1. How big is it? … the observable universe is currently 93 billion light years across. The whole universe is probably infinite. 2. Is there an edge? The observable universe does. …, and the whole universe has a temporal edge or what we call a beginning, but almost certainly not a spatial one. 3. Is there a center? The observable universe has a center—us. We are at the center of the observable universe because the observable uni