天文学家创造首个虚拟宇宙-凯发k8官网

天文学家创造首个虚拟宇宙
文章来源:未知 文章作者:enread 发布时间:2014-05-08 07:56 字体: [ ] 
(单词翻译:双击或拖选)
move over, matrix -- 1 have done you one better. they have created the first realistic virtual universe using a computer simulation called "illustris." illustris can recreate 13 billion years of cosmic evolution in a cube 350 million light-years on a side with 2 resolution. "until now, no single simulation was able to reproduce the universe on both large and small scales simultaneously," says lead author mark vogelsberger (mit/harvard-smithsonian center for astrophysics), who conducted the work in 3 with researchers at several institutions, including the heidelberg institute for theoretical studies in germany.
 
these results are being reported in the may 8th issue of the journal nature.
 
previous attempts to simulate the universe were 4(阻碍) by lack of 5 power and the 6 of the 7 physics. as a result those programs either were limited in resolution, or forced to focus on a small portion of the universe. earlier simulations also had trouble modeling complex feedback from star formation, supernova explosions, and supermassive black holes.
 
illustris employs a sophisticated computer program to recreate the evolution of the universe in high 8. it includes both normal matter and dark matter using 12 billion 3-d "pixels," or resolution elements.
 
the team 9 five years to developing the illustris program. the actual calculations took 3 months of "run time," using a total of 8,000 cpus running in parallel. if they had used an average 10 computer, the calculations would have taken more than 2,000 years to complete.
 
the computer simulation began a 11 12 million years after the big bang. when it reached the present day, astronomers counted more than 41,000 12 in the cube of simulated space. importantly, illustris yielded a realistic mix of spiral galaxies like the 13 way and football-shaped elliptical galaxies. it also recreated large-scale structures like 14 clusters and the bubbles and voids of the cosmic web. on the small scale, it 15 recreated the chemistries of individual galaxies.
 
since light travels at a 16 speed, the farther away astronomers look, the farther back in time they can see. a galaxy one billion light-years away is seen as it was a billion years ago. telescopes like hubble can give us views of the early universe by looking to greater distances. however, astronomers can't use hubble to follow the evolution of a single galaxy over time.
 
"illustris is like a time machine. we can go forward and backward in time. we can pause the simulation and 17 into a single galaxy or galaxy cluster to see what's really going on," says co-author shy genel of the cfa.


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1 569155f16962e086bd7de77deceefcbd     
n.天文学者,天文学家( astronomer的名词复数 )
参考例句:
  • astronomers can accurately foretell the date,time,and length of future eclipses. 天文学家能精确地预告未来日食月食的日期、时刻和时长。 来自《简明英汉词典》
  • astronomers used to ask why only saturn has rings. 天文学家们过去一直感到奇怪,为什么只有土星有光环。 来自《简明英汉词典》
2 7gsyj     
adj.无前例的,新奇的
参考例句:
  • the air crash caused an unprecedented number of deaths.这次空难的死亡人数是空前的。
  • a flood of this sort is really unprecedented.这样大的洪水真是十年九不遇。
3 bw7yd     
n.合作,协作;勾结
参考例句:
  • the two companies are working in close collaboration each other.这两家公司密切合作。
  • he was shot for collaboration with the enemy.他因通敌而被枪毙了。
4 3c5fb339e8465f0b89285ad0a790a834     
妨碍,束缚,限制( hamper的过去式和过去分词 )
参考例句:
  • the search was hampered by appalling weather conditions. 恶劣的天气妨碍了搜寻工作。
  • so thought every harassed, hampered, respectable boy in st. petersburg. 圣彼德堡镇的那些受折磨、受拘束的体面孩子们个个都是这么想的。
5 tvbzxs     
n.计算
参考例句:
  • to work in computing 从事信息处理
  • back in the dark ages of computing, in about 1980, they started a software company. 早在计算机尚未普及的时代(约1980年),他们就创办了软件公司。
6 b217e6f6e3d61b3dd560522457376e61     
复杂性(complexity的名词复数); 复杂的事物
参考例句:
  • the complexities of life bothered him. 生活的复杂使他困惑。
  • the complexities of life bothered me. 生活的杂乱事儿使我心烦。
7 5fyz8c     
adj.在下面的,含蓄的,潜在的
参考例句:
  • the underlying theme of the novel is very serious.小说隐含的主题是十分严肃的。
  • this word has its underlying meaning.这个单词有它潜在的含义。
8 vk3xb     
n.忠诚,忠实;精确
参考例句:
  • there is nothing like a dog's fidelity.没有什么能比得上狗的忠诚。
  • his fidelity and industry brought him speedy promotion.他的尽职及勤奋使他很快地得到晋升。
9 duhzy2     
adj.一心一意的;献身的;热诚的
参考例句:
  • he dedicated his life to the cause of education.他献身于教育事业。
  • his whole energies are dedicated to improve the design.他的全部精力都放在改进这项设计上了。
10 sucznx     
n.桌面管理系统程序;台式
参考例句:
  • my computer is a desktop computer of excellent quality.我的计算机是品质卓越的台式计算机。
  • do you know which one is better,a laptop or a desktop?你知道哪一种更好,笔记本还是台式机?
11 rc1xe     
adj.纯粹的;仅仅,只不过
参考例句:
  • that is a mere repetition of what you said before.那不过是重复了你以前讲的话。
  • it's a mere waste of time waiting any longer.再等下去纯粹是浪费时间。
12 fa8833b92b82bcb88ee3b3d7644caf77     
星系( galaxy的名词复数 ); 银河系; 一群(杰出或著名的人物)
参考例句:
  • quasars are the highly energetic cores of distant galaxies. 类星体是遥远星系的极为活跃的核心体。
  • we still don't know how many galaxies there are in the universe. 我们还不知道宇宙中有多少个星系。
13 jd0xg     
adj.牛奶的,多奶的;乳白色的
参考例句:
  • alexander always has milky coffee at lunchtime.亚历山大总是在午餐时喝掺奶的咖啡。
  • i like a hot milky drink at bedtime.我喜欢睡前喝杯热奶饮料。
14 ohoxb     
n.星系;银河系;一群(杰出或著名的人物)
参考例句:
  • the earth is one of the planets in the galaxy.地球是银河系中的星球之一。
  • the company has a galaxy of talent.该公司拥有一批优秀的人才。
15 ojhyf     
adv.准确地,精确地
参考例句:
  • it is hard to hit the ball accurately.准确地击中球很难。
  • now scientists can forecast the weather accurately.现在科学家们能准确地预报天气。
16 jskzzj     
adj.固定的,不变的,准备好的;(计算机)固定的
参考例句:
  • have you two fixed on a date for the wedding yet?你们俩选定婚期了吗?
  • once the aim is fixed,we should not change it arbitrarily.目标一旦确定,我们就不应该随意改变。
17 venzwt     
n.急速上升;v.突然扩大,急速上升
参考例句:
  • the airplane's zoom carried it above the clouds.飞机的陡直上升使它飞到云层之上。
  • i live near an airport and the zoom of passing planes can be heard night and day.我住在一个飞机场附近,昼夜都能听到飞机飞过的嗡嗡声。
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tag标签: computer universe
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