首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
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)
admin
2011-01-10
70
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.
The phrase“an astronomical object”in paragraph 2 refers to
选项
A、cosmic dark ages.
B、dust and gas.
C、a protostar.
D、the early universe.
答案
C
解析
短文第二段最后一句提到“模拟最终在夜空中闪耀的天体的形成过程”。第三段第一句提到“这一研究的结果是对原恒星-宇宙中巨大的原始星体的形成的详细描述”。这两句话相互照应,故选C。
转载请注明原文地址:https://kaotiyun.com/show/TfLd777K
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
ScientistsDevelopWaysofDetectingHeartAttackGermanresearchershavecomeupwithanewgenerationofdefibrillators(除颤
ScientistsDevelopWaysofDetectingHeartAttackGermanresearchershavecomeupwithanewgenerationofdefibrillators(除颤
CaribbeanIslandsWhatwouldyouseeifyoutookacruisetotheCaribbeanIslands?Palmtreesandcoconuts(椰子)?Whitebeach
JapaneseCarKeepsWatchforDrunkDriversAconceptcardevelopedbyJapanesecompanyNissanhasabreathalyzer-likedetect
Thousandsofpeopleperishedinthestorm.
NaturalMedicinesSinceearliestdays,humanshaveusedsomekindsofmedicines.Weknowthisbecausehumanshavesurvived.
ProlongingHumanLife1Prolonginghumanlifehasincreasedthesizeofthehumanpopulation.Manypeoplealivetodaywouldhave
Don’thazardyourreputationbysupportinghisjointventurewiththegayfromLosAngels.
FoodandHealthThefoodyoueatdoesmorethanprovideenergy.Itcanhaveadramaticeffectonyourbody’sabilitytofig
Ithardfortheyoungpeopletoimaginewhatsevereconditionstheirparents.onceliveduder.
随机试题
Researchonfriendshiphasestablishedanumberoffacts,someinteresting,someevenuseful.Didyouknowthattheaveragestud
设y1(x),y2(x是二阶常系数线性微分方程yˊˊ+Pyˊ+qy=0的两个线性无关的解,则它的通解为________.
干姜的主治病证有
高血压危急症的处理原则最主要的是()
小儿,阵发性痉挛性咳嗽1个半月,经治疗咳嗽减轻,但痰粘难以咳出,伴低热,烦躁盗汗,舌红苔少,脉细数。治疗应首选方剂
狭义的金融犯罪是指金融业务活动本身的犯罪,主要是指“破坏金融管理秩序罪”及“金融诈骗罪”;广义的金融犯罪还包括金融机构工作人员的职务犯罪,如贪污、受贿、挪用公款罪等。()
初次见面握手时间应控制在3秒钟内,切记不可戴手套。()
国际足联总部位于()。
简述赫尔巴特的教学理论。【2012年-天津师大】【2015年-北师大】【2019年-苏州大学】
TheemploymentdiscriminationlawsuitagainstWal-Mart,whichtheSupremeCourtheardlastweek,isthelargestinAmericanhist
最新回复
(
0
)