How the First Stars in the Universe Came into Existence
2. The composition of the early universe was quite different from that of today, and the physics that governed the early universe were also somewhat simpler. Dr. Naoki Yoshida and colleagues in Japan and the U. S. incorporated these conditions of the early universe, sometimes referred to as the cosmic dark ages, to simulate the formation of an astronomical object that would eventually shine its light into this darkness.
4. According to their simulation, gravity acted on minute density variations in matter, gases, and the mysterious dark matter of the universe after the Big Bang in order to form this early stage of a star - a protostar with a mass of just one percent of our sun. The simulation reveals how pre-stellar gases would have actually evolved under the simpler physics of the early universe to form this protostar. Dr. Yoshidas simulation also shows that the protostar would likely evolve into a massive star capable of synthesizing heavy elements, not just in later generations of stars, but soon after the Big Bang.
6. Their simulation of the birth of a protostar in the early universe signifies a key step toward the ambitious goal of piecing together the formation of an entire primordial star and of predicting the mass and properties of these first stars of the universe. More powerful computers, more physical data, and an even larger range will be needed for further calculations and simulations, but these researchers hope to eventually extend this simulation to the point of nuclear reaction initiation when a stellar object becomes a true star.
astronomical adj. 天文的;天文学的
synthesize v.合成,综合
stellar adj.恒星的;星球的
注释:
2. burning question:最吸引人的问题,亟待解决的问题。
4. protostar 原恒星,就是处于原始状态的恒星。原恒星由 大爆炸后产生的星际云演变而来。
信息词
1. What can the state-of-the-art computer simulation tell us about?
B.How the Big Bang marked the beginning of our universe.
D.How dust grains and gases form after the Big Bang.
2. What does the astronomical object refer to?
B.Cosmic dark ages.
D.Dust grains and gases.
n.分钟 a.微小的
A.A unit of time equal to one sixtieth of an hour.
C.Exceptionally large.
原恒星
A.It had a mass of one percent of the sun.
C.It began to combine heavy elements after it evolved into a massive star.
信息词
A.To know more about the mass and properties of the first stars of the universe. .
C.To know how a stellar object becomes a true star.
答案与题解:
2. C 根据上下文,astronomical object 指的是上段第二句中的first stars,即下面一段第一句中的protostar。
4. B A、C 和 D 的表述都可以在本段中找到。从上文和该段的最后一个句子可以得知,原恒星进化的过程不是在宇宙大爆炸之前发生。所以,应该选择 B。
2013年北京中考成绩什么时候出来?
2013年北京市海淀区中考成绩查询入口
名师指导:新初三暑秋英语学习规划
张澄老师谈:中考100天英语规划复习二三事
今年中考考试说明本周发布 内容将局部调整
2013年中考成绩查询方式
2013年北京市西城区中考成绩查询入口
学会如何猜测词义 提升中考阅读水平(三)
英语期末统考对中考的启示与关联
2013年北京市丰台区中考成绩查询入口
2013年北京中考成绩查询入口汇总
初三毕业班学生应对期末考试的七大杀招
2013年北京第一时段中考报名25日结束
中考英语重点词汇考点归纳
中考英语正确答题夺高分 实力技巧两者缺一不可
中考政策变化 会考首次全市统一考试网上阅卷
2013年北京中考大事早知道
2013年北京市海淀区中考分数段(官方版)
2013年北京市朝阳区中考成绩查询入口
如何走出中学英语词汇学习误区
2012年北京东城区部分高中录取分数线
赢战中考2011:最后冲刺英语每天“三个一”
2013年北京中考成绩查询官网
2013年北京市石景山区中考成绩查询入口
2013年北京市郊县中考成绩查询入口
学会如何猜测词义 提升中考阅读水平(一)
中考最后冲刺:如何提高英语考试成绩?
2012中考英语考纲微调:听力分值增加
专家建议:孩子学习英语 最好先培养兴趣
2013年北京中考成绩查询入口
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |