12月悦读考古，月球形成的三种学说~~~求确认！！！！！！

冰糖葫芦sissi

春哥有整理過，比較清楚。是講月球形成的三種學說，第一段總講，第二段反駁，第三店提出新的看法。

-- by 会员 airychasedream (2012/12/6 13:06:42)

求问春哥整理的那个在哪里可以找到？thx~

-- by 会员 冰糖葫芦sissi (2012/12/6 16:39:38)

-- by 会员 zzzgjy (2012/12/6 20:05:07)

谢谢！！那个。。密码是多少？灰常感谢！！

海砂516

阅读有一篇考到了月球是怎么形成的那道考古题

考古
第一段说一个“fission理论” 说moon是earth的mantle飞出orbit的一个fraction，一个“coa理论”说月球和地球是一起产生的。“catch理论”说月球是在宇宙里飘呀飘就被地球抓着了就一起玩了。
第二段对以上3种理论一一否定：
三点独立反驳：
【如果F成立，现在的地月系统应该自转更快，应该还有很多小的卫星体在地球周围】
【如果CA成立，月亮这个独立的星体应该运动的很慢，以至于能落入地球的系统】
【如果CO成立，它应该具有和地球类似的组成。但是发现月球表面锌还有别的一个金属的含量很低（高）；月球缺少某些足够的星球形成具备的元素】
两两混合反驳：
【地球上含量高的成分诸如水元素 锌元素等在月球上都很少，否定“F理论”和“coa理论”。 】
【月球的内核很小如果是自己在宇宙中孕育出来的要比这大得多，于是也否定了“Coa理论”和“catch理论” 】
第三段提出了个现在广为接受的理论：是宇宙中的星体与地球撞击弹出来的。因为弹出的都是星体表层所以解释了月球内核小等以上问题。


Q1：如果月球是CAPTURE来的，那么一下哪个为真
Q2：如果月球是和地球同时形成的，它应该具有和地球类似的组成。（选：月球上挥发金属会更多)
Q3：假如第二个理论（地月同时产生）是真的话，月亮会怎样。（选：核会很大)
Q4：以下哪个点成立可以削弱科学家的结论。（选：月亮的内核其实比科学家原来预测的大）
Q5：if the fission(分裂学说） model is true, the moon that differ the current is 。。（就是如果fission是正确的，月亮会与现在的有什么不同。）    几经上说是spin faster or slower. 当时做题的时候出现了spin slower，但是回文中定位发现in fission model earth and moon have much more spin. 就是说要快，所以这个不对，我选择的是月亮周围会有很多Material.因为定为第一段说fission是地球甩出去很多物质。
Q6：哪个现象出现在同时形成这个学说 中，JJ是说选moon size的，但是题目中有两个跟size有关，一个是the moon size relative to earth. 一个是the size of moon core. 选后面一个，确定。
Q7：以下哪个如果为真，将会对capture的反驳（记得是反驳！）理论造成冲击，我选的如果发现月球的core其实要大一点。
Q8：主旨题

参考文献：
THX to Steven Ren, who find it in WIKI
Several mechanisms have been historically proposed for the Moon's formation 4.527 ± 0.010 billion years ago, some 30–50 million years after the origin of the Solar System.[15] These include the fission of the Moon from the Earth's crust throughcentrifugal forces,[16] which would require too great an initial spin of the Earth,[17] the gravitational capture of a pre-formed Moon,[18] which would require an unfeasibly extended atmosphere of the Earth to dissipate the energy of the passing Moon,[17] and the co-formation of the Earth and the Moon together in the primordial accretion disk, which does not explain the depletion of metallic iron in the Moon.[17] These hypotheses also cannot account for the high angular momentum of the Earth–Moon system.[19]

The prevailing hypothesis today is that the Earth–Moon system formed as a result of a giant impact: a Mars-sized body hit the proto-Earth, blasting material into orbit around the proto-Earth, which accreted to form the Moon.[20] Giant impacts are thought to have been common in the early Solar System. Computer simulations modelling a giant impact are consistent with measurements of the angular momentum of the Earth–Moon system, as well as the small size of the lunar core.[21]Unresolved questions are the relative sizes of the proto-Earth and impactor,[20] and how much material from these two bodies formed the Moon. However, recent oxygen isotope composition analysis of the Moon shows its oxygen isotope composition is more similar to the Earth's than this hypothesis would suggest.[22]

The large amount of energy released in the giant impact event and the subsequent reaccretion of material in Earth orbit would have melted the outer shell of the Earth, forming a magma ocean.[23][24] The newly formed Moon would also have had its own lunar magma ocean; estimates for its depth range from about 500 km to the entire radius of the Moon.[23]

Lizzlee

（是它！是它~！就是它~我们的小哪吒小哪吒~~）先唱首歌。。。就是这篇，题目一模一样。。

zzzgjy

密码是lyc