Forming a Moon with an Earth-like composition via a giant impact.

@article{Canup2012FormingAM,
  title={Forming a Moon with an Earth-like composition via a giant impact.},
  author={Robin Canup},
  journal={Science},
  year={2012},
  volume={338 6110},
  pages={1052-5}
}
In the giant impact theory, the Moon formed from debris ejected into an Earth-orbiting disk by the collision of a large planet with the early Earth. Prior impact simulations predict that much of the disk material originates from the colliding planet. However, Earth and the Moon have essentially identical oxygen isotope compositions. This has been a challenge for the impact theory, because the impactor's composition would have likely differed from that of Earth. We simulated impacts involving… CONTINUE READING