2. 外语
  3. How the First Stars in the Universe Came into Existence Researchers believe that our universe began with the Big Bang(宇宙大爆炸)

How the First Stars in the Universe Came into Existence Researchers believe that our universe began with the Big Bang(宇宙大爆炸)

admin2011-01-10  32
问题                 How the First Stars in the Universe Came into Existence
    Researchers believe that our universe began with the Big Bang(宇宙大爆炸)about 13 billion years ago，and that soon after that event，matter began to form as small dust grains and gases．How the first stars formed from this dust and gas has been a burning question for years，but a state of-the-art computer simulation now offers the most detailed picture yet of how these first stars in the universe came into existence．
    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．
    The result is a detailed description of the formation of a protostar(原恒星)-the early stage of a massive primordial(原始的)star of our universe-and the researchers’computer simulation sets the bar for further investigation into the star formation process．The question of how the first stars evolved is so important because their formations and eventual explosions provided the seeds for subsequent stars to come into being．
    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(前恒星的) gases would have actually evolved under the simpler physics of the early universe to form this protostar． Dr．Yoshida’s simulation also shows that the protostar would likely evolve into a massive star capable of synthesizing(合成)heavy elements，not just in later generations of stars，but soon after the Big Bang．
    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(星球的)object be comes a true star．
According to the last paragraph，all of the following are the goals of the simulation project EX CEPT
选项 A、to know more about the mass and properties of the first stars of the universe．
B、to simulate the process of how the early universe began．
C、to apply the simulation to the study of nuclear reaction initiation．
D、to discover the truth about the formation of a protostar．
答案B
解析 短文最后一段提到了这个模拟项目的目标包括原恒星的形成，了解更多宇宙中最初的星体的质量和性质的知识以及将这个模拟结果应用于核反应初期，由此可知，并未提及“模拟早期宇宙的形成过程”，故选B。
转载请注明原文地址:https://kaotiyun.com/show/FfLd777K
本试题收录于： 职称英语理工类A级题库职称英语分类
0

职称英语理工类A级

职称英语

相关试题推荐
随机试题
最新回复(0)