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Iron shortage not prob option 3 - it sinks to the center of even an accreation disc.
===Consequences for the Coaccretion Hypothesis===
===Consequences for the Coaccretion Hypothesis===
This model does not require low probability events to occur, in contrast to the Capture model, and provides a cogent explanation as to why the Earth and Moon share a common oxygen isotope composition. However, there are unanswered questions regarding the angular momentum of the two bodies, and the observed lack of iron on or inside the Moon counts against the theory as well. (It should be mentioned that there have been attempts to address this problem recently: see [[#Current Status|Current Status]].).<ref name="Nova1"/>
This model does not require low probability events to occur, in contrast to the Capture model, and provides a cogent explanation as to why the Earth and Moon share a common oxygen isotope composition. However, there are unanswered questions regarding the angular momentum of the two bodies (It should be mentioned that there have been attempts to address this problem recently: see [[#Current Status|Current Status]].).<ref name="Nova1"/>
==Giant Impact Hypothesis==
==Giant Impact Hypothesis==