Black holes lead stars to self-destruct Scientists have long understood that supermasvive black holes weighing. Millions or billions of suns can tear apart stars that come too close. The black holegravity pulls harder on the neatest part of the star, an imbalance that pulls the star apart over a period of minutes or hours, once it gets close enough. When the star gets Close enough, the uneven forces flatten it into a pancake shape. Some previous studies had suggested this flattening would increase the density and temperature inside the star enough to trigger intense nuclear reactions that would tear it apart. But other studies had suggested that the picture would he complicated by shock waves generated during the flattening process and that not nuclear explosion should occur. The devouring of stars by black holes may already have been observed, although at a much later stage. It is thought that several months after the event that rips the star apart, its matter starts swirling into the hole itself. It heats up as it does so, releasing ultraviolet light and X-rays. Brassart aggress. Perhaps it can be observed in the X-rays and gamma rays, but its something that needs to be more studied,he says. Supernova researcher Chris Fryer of the Los Alamos National Laboratory in Los Almos, New Mexico, US, says the deaths of these stars are difficult to simulate, and he is not sure whether the researchers have proven their case they exploded in the process. A the black hole could tear apart the star C the black hole could dwindle its size considerably 2.According to the third paragraph, researchers differed from each other in the problem of B whether the stars would increase its density and temperature D whether the uneven forces would flatten the stars A No nuclear explosion would be triggered inside the star C. Much of the stars matter thrown by the explosion would be beyond the black holes reach 4.What will happen several months after the explosion of the star? B the black holes matter will heat up D the black holes matter will release ultraviolet light and X-rays A confusion C interruption
2016届高考英语(新课标全国卷Ⅰ)二轮复习课件:专题6 短文改错
2016届高考英语(新课标全国卷Ⅰ)二轮复习课件:专题7 书面表达
2016届高考英语二轮复习语法专项突破:第3节 形容词和副词(北师大版)
英媒炒作梅姨的大长腿 全英人民怒了
2016届高考英语(新课标全国卷Ⅰ)二轮复习课件:专题4 完形填空
2016届高考英语二轮复习语法专项突破:第2节 代词和it的用法(北师大版)
2016届高考英语二轮复习语法专项突破:第8节 定语从句(北师大版)
2016届高考英语(新课标全国卷Ⅰ)二轮复习课件:专题2 阅读理解 第5讲
2016届高考英语(新课标全国卷Ⅰ)二轮复习课件:专题1 名词、冠词和代词
2016届高考英语二轮复习语法专项突破:第5节 动词的时态和语态(北师大版)
2016届高考英语二轮复习课时提升练:19 选修7 Unit 19 Language(北师大版)
2016届高考英语二轮复习练习:必修4(北师大版)
2016届高考英语二轮阅读理解和短文改错选练(1)(新人教版)
2016届高考英语二轮复习语法专项突破:第7节 情态动词和虚拟语气(北师大版)
2016届高考英语(新课标全国卷Ⅰ)二轮复习课件:专题2 阅读理解 第3讲
2016届高考英语二轮复习课时提升练:17 选修6 Unit 17 Laughter(北师大版)
2016届高考英语二轮复习语法专项突破:第6节 非谓语动词(北师大版)
2016届高考英语二轮复习语法专项突破:第4节 介词和连词(北师大版)
2016届高考英语二轮复习课时提升练:20 选修7 Unit 20 New Frontiers(北师大版)
2016届高考英语二轮复习课时提升练:16 选修6 Unit 16 Stories(北师大版)
唱片葬、烟花葬……无奇不有的遗体处理方式
2016届高考英语(新课标全国卷Ⅰ)二轮复习课件:专题7 并列句和状语从句
2016届高考英语二轮复习课时提升练:21 选修7 Unit 21 Human Biology(北师大版)
2016届高考英语二轮复习语法专项突破:第9节 名词性从句(北师大版)
2016届高考英语(新课标全国卷Ⅰ)二轮复习课件:专题2 阅读理解 第4讲
2016届高考英语(新课标全国卷Ⅰ)二轮复习课件:专题3 七选五
2016届高考英语二轮复习练习:选修7(北师大版)
2016届高考英语二轮复习语法专项突破:第1节 名词和冠词(北师大版)
2016届高考英语二轮复习课时提升练:24 选修8 Unit 24 Society(北师大版)
2016届江苏省高考英语二轮专项突破:题型组合练(3)
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |