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[考古] by feid1984
第一段:讲的就是先。有三个理论,一是fission(就称F吧)什么的,说月亮是地球转着转着甩出去的;二是A(就叫做A吧)开头的一个词,说是月亮和地球是同时由同样的方式形成的;三是capture理论(就叫做C吧),月亮是某个外面的天体飞过来,被地球引力抓住的。
第二段:作者就挨个批评了。主要从两个方面,首先是旋转速度,说要是fission的话,地月旋转速度不知道比现在快多少呢,又说如果是A的话,速度肯定又要慢得多,最后说如果C的话,更没道理,不可能一个外面飞的更快的东东的飞到地月体系就变慢了吧;然后说从物质构成上也不可能滴,说了一个FACT是月球上很少V物质(地球上很多滴),然后又说的如果是C理论的话,月球iron构成的core应该要比现在大得多(大概是这样)。
note:这些证据不是一对一的驳回,而常是一对多的驳回,有两个题是 在这儿,我是后来才发现的,唉,因为觉得是JJ,所以作得太快,根本没有去仔细定位,吸取教训啊。
第三段:说最近又有个新理论出现了,比较能解释这些情况,就是collision theory,说月球是撞出来滴~以前有一个星体和地球撞了一下,撞出去的地球的物质就那个星体一起形成了月亮,而那些V物质在碰撞的高温(或者是其他条件下消失了)这个可以解释月球上问什么这个东西少,而由于这两个东西是成一定角度的撞滴,所以形体的速度变慢了
题目:
有四个问题,我不太记得的,我前面题做得太慢了,后面进入状态后只能追着追着做了
总之似乎第三段反而没考点,考点3集中集中在第二段,都是问,这个怎么怎么反驳之类的,大家注意仔细看第二段,比较混乱。分别有3个题,都是细节题针对三种理论。答案应该是:1,月亮与地球spin的关系看出理论1不成立 2,由月亮的core的构成可以判断理论2。3,由月亮的size
背景:
Formation
Several mechanisms have been suggested for the Moon's formation. Early speculation proposed that the Moon broke off from the Earth's crust because of centrifugal forces, leaving a basin (presumed to be the Pacific Ocean) behind as a scar.[30] This fission concept, however, requires too great an initial spin of the Earth. Others speculated that the Moon formed elsewhere and was captured into Earth's orbit.[31] However, the conditions required for this capture mechanism to work (such as an extended atmosphere of the Earth for dissipating energy) are improbable. The coformation hypothesis posits that the Earth and the Moon formed together at the same time and place from the primordial accretion disk. In this hypothesis, the Moon formed from material surrounding the proto-Earth, similar to the formation of the planets around the Sun. Some suggest that this hypothesis fails to adequately explain the depletion of metallic iron in the Moon. A major deficiency with all of these hypotheses is that they cannot easily account for the high angular momentum of the Earth–Moon system.[32]
Today, the giant impact hypothesis for forming the Earth–Moon system is widely accepted by the scientific community. In this hypothesis, the impact of a Mars-sized body on the proto-Earth is postulated to have put enough material into circumterrestrial orbit to form the Moon.[1] Given that planetary bodies are believed to have formed by the hierarchical accretion of smaller bodies to larger ones, giant impact events such as this are thought to have affected most planets. Computer simulations modelling this impact are consistent with measurements of the angular momentum of the Earth–Moon system, as well as the small size of the lunar core.[33] Unresolved questions regarding this theory have to do with determining the relative sizes of the proto-Earth and impactor, and with determining how the material from the proto-Earth and the impactor was distributed when it formed the Moon. The formation of the Moon is believed to have occurred 4.527 ± 0.01 billion years ago, about 30–50 million years after the origin of the solar system.[34] |
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