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
大学英语6级词汇语法冲刺备考题及答案(4)
英语六级考试完形填空真题答案
英语六级考试常考短语归纳(3)
英语六级翻译答案
考前必背大学英语六级作文提分亮点词汇
英语六级考试通关必备高频词汇
英语六级备考高频词汇复习笔记
历年英语六级考试中出现的超纲词组和固定搭配
名师指导英语六级考试综合部分最后突破
推荐历年英语六级听力常考高频词汇完整版
大学英语六级考试翻译通关班讲义
名师推荐英语六级考前突击必看高频词汇
英语六级完型填空务必掌握的重要表达
大学英语六级考试汉译英讲义精选
英语六级词汇天天记看对话记单词(1)
大学英语六级考试高频核心词汇
英语六级考试经典100句
英语六级高频词汇巧思妙解记忆(2)
大学英语六级历年真题常考的词汇汇总(阅读)
英语六级高频词巧记忆
大学英语六级词汇复习的超强记忆法则
英语六级考试高频基础词汇500个
高效备战六级考试完形填空常考逻辑衔接词
大学英语六级考试必会词组(3)
大学英语6级词汇语法冲刺备考题及答案(3)
英语六级考试大纲高频出现的词汇(出现1620次)
大学英语六级考试完形填空答案
英语六级备考常见词组搭配大全
英语六级翻译答案
推荐英语六级词汇大全
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |