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
2011年实用口语练习:英语客套话
2011年实用口语练习:昙花一现式的一夜成名
2011年实用口语练习:“挑刺儿”
2011年实用口语练习:各种哭的说法(一)
2011年实用口语练习:与天气有关的口语(下)
如何用英文表达“我不太想做某事”
2011年实用口语练习:Join a club 社团活动
英语口语-商业谨致问候语
2011年实用口语练习:“锅中的火花”
英语口语:怎样放“狠话”让对方离你远点
2011年实用口语练习:Assignment 家庭作业
2011年实用口语练习:别想宰我,我识货
9句狠话教你怎么用英语让人“滚开”
2011年实用口语练习:说客 拾人牙慧
英语口语-商业信函用语引言
如何用英文表达“欣赏,感激”
2011年实用口语练习:Select courses 选课
2011年实用口语练习:In the bookstore 在书店里
2011年实用口语练习:课余阅读
2011年实用口语练习:我是无辜的
2011年实用口语练习:生活奢华的猪
2011年实用口语练习:口语当中的ball
2011年实用口语练习:劝君“上当”一回
2011年实用口语练习:歉意如何说出口 1
如何用英文表达“你活该”
2011年实用口语练习:当猪飞起来的时候
英文结婚短信祝福语
英语口语-害羞
如何提高英语口语
2011年实用口语练习:各种哭的说法(二)
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |