# Chapter 6: Contending With Neighbors
###### tags: `Habitable Planet` `Moons`

:::info
### group members
+ Chuah Dee Kai
+ Wu Gen Quan
+ Yang Fang Yu
:::

## Outline
+ Moons in solar system vs earth's Moon
+ four hypothesized for the Moon
+ Which hypothesis for the Moon's origin is correct
+ One paper related to Moon
+ erik hauri

:::success
## paper
+ apollo results
1970s bring back lunar sample to Earth
heating up samples by 500 celsius to analyse molecular Hydrogen and H2O
+ In terms of H2O content in regolith breccias and in bulk soils, no regional variations were detected, both displaying a range of H2 O contents between approximately 100 and 450 ppm (figure 1a). However, the amount of H2 extracted is clearly lower in bulk soils (approx. 0– 60 ppm) than in regolith breccias (approx. 35–100 ppm; figure 1a).
+ How well lunar apatites preserve the indigenous magmatic water?


(1)Terrestrial contamination
(2)Shock-induced effects
(3)
different speed move through magma(say about time scale)，漸層分析，

bubble~tje air condition
ydrogen from solar wind
(4)Post-crystallization diffusion
(5)Water in the lunar magma ocean and mare basalt source regions

:::

每種岩石中是有一定成分的水，你雖然拿不走它，但是它卻在melting point幫助fuild的流動，所以岩石中的水分在月地質的探討裡是一個很重要的一個分析。

撞擊的video
https://youtu.be/o2lRpiediP8?t=343

lunar time-zero
1. ejection of material into Earth orbit via the giant impact
2. spreading, cooling and fragmentation of the proto-lunar disk leading ultimately to coalescence of the moon
3. cooling and crystallization of the lunar magma ocean(LMO)

proto-earth -> thea

1. impact mass ejection
有人模擬了 大質量的撞擊 是有辦法將 proto-earth 10% + impactor's 30%

2. the proto-lunar disk
fluid dynamic modeling -> a disk of > 1 moon mass -> stable state 3000~7000k

2 phase mixture of silicate melt & vapor convects 3D -> one day ~ one week

光滑粒子流体动力学（英语：smoothed-particle hydrodynamics, SPH）是一种用于模拟连续介质动力学的计算方法
-> vapor phase : hydrogen less

disk condensation -> x~10 years(depend on temperature of disk)

3.