9月GMAT阅读机经:宇宙扩展galaxy.

　　9月GMAT机经换库了，现在就由小编来为大家整理九月份的GMAT阅读机经整理，下面是关于GMAT阅读机经的相关问题，分享给大家，希望对大家有所帮助，文中观点仅供参考。

　　本月原始 【By Annia35】

　　银河和宇宙的膨胀那一篇也有遇到，问题有：文中提哥白尼的目的是什么(我选的是否定他的宇宙静止论, 不知道对不对时间有点赶没怎么看完文章)，还有一题是主旨题

　　考古+分析 【By 元叔】

　　※ 主题思路：

　　理论：宇宙是向外扩张的;

　　实验：2个实验证明宇宙是扩张的观点;射线的rate测试出距离;

　　最后补充结论：

　　但是东西逃逸不出去后，就又回到了奇点，回到了Big Bang;

　　某种射线的规律

　　※ 段落大意：

　　第一段：宇宙是变化的，不是固定不变;

　　是讲在1920年，发现了一个理论，好像是galaxies是不断变大的，举了个例子，就像是蛋糕里面的面粉发酵一样。然后又说道这个发现就证明了著名的Copernicus theory关于galaxies是static是错误的;

　　第二段：实验证明宇宙是变化的观点;

　　两位 仁兄S和M通过实验发现了red shift，然后spectral line，怎么怎么的，没怎么看懂;

　　第三段：1930年后的同样方法证明观点;

　　是讲在1930年后，又发现了Huber Law，什么velocity equal to什么的，证明galaxies locomotion是uniform的

　　第三段讲1930s科学家又拿这方法研究了偏远一点的galaxy 好像也是这么个结论，中间提到发现远离rate好像等于什么*distance，第四段暂时想不起来了。。。。

　　※ 题目：

　　1)作者提到Copernicus theory的目的是什么：

　　宇宙是向外扩张的;

　　2)作者提到spectral line是为了证明什么

　　射线rate和距离的关系;

　　※ 维基补充材料：

　　红移：

　　In 1929 Edwin Hubble, working at the Carnegie Observatories in Pasadena, California, measured the redshifts of a number of distant galaxies. He also measured their relative distances by measuring the apparent brightness of a class of variable stars called Cepheids in each galaxy. When he plotted redshift against relative distance, he found that the redshift of distant galaxies increased as a linear function of their distance. The only explanation for this observation is that the universe was expanding.

　　In physics (especially astrophysics), redshift happens when light seen coming from an object that is moving away is proportionally increased in wavelength, or shifted to the red end of the spectrum. More generally, where an observer detects electromagnetic radiation outside the visible spectrum, "redder" amounts to a technical shorthand for "increase in electromagnetic wavelength" — which also implies lower frequency and photon energy in accord with, respectively, the wave and quantum theories of light.

　　红移在物理学和天文学领域，指物体的电磁辐射由于某种原因波长增加的现象，在可见光波段，表现为光谱的谱线朝红端移动了一段距离，即波长变长、频率降低。红移的现象目前多用于天体的移动及规律的预测上。

　　Meanwhile, other physicists and mathematicians working on Einstein&aposs theory of gravity discovered the equations had some solutions that described an expanding universe. In these solutions, the light coming from distant objects would be redshifted as it traveled through the expanding universe. The redshift would increase with increasing distance to the object.

　　Once scientists understood that the universe was expanding, they immediately realized that it would have been smaller in the past. At some point in the past, the entire universe would have been a single point. This point, later called the big bang, was the beginning of the universe as we understand it today.

　　The expanding universe is finite in both time and space. The reason that the universe did not collapse, as Newton&aposs and Einstein&aposs equations said it might, is that it had been expanding from the moment of its creation. The universe is in a constant state of change. The expanding universe, a new idea based on modern physics, laid to rest the paradoxes that troubled astronomers from ancient times until the early 20th Century.

　　以上就是对于9月GMAT阅读机经的相关介绍，希望对大家备考GMAT考试有所帮助，文中观点仅供参考。