Where Did the Moon Come From?

@article{Belbruno2004WhereDT,
  title={Where Did the Moon Come From?},
  author={Edward Belbruno and J. Richard Gott III},
  journal={The Astronomical Journal},
  year={2004},
  volume={129},
  pages={1724 - 1745}
}
The current standard theory of the origin of the Moon is that Earth was hit by a giant impactor the size of Mars, causing ejection of iron-poor impactor mantle debris that coalesced to form the Moon. But where did this Mars-sized impactor come from? Isotopic evidence suggests that it came from 1 AU radius in the solar nebula, and computer simulations are consistent with its approaching Earth on a zero-energy parabolic trajectory. But how could such a large object form in the disk of… 
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