Abstract
The hypothesis is advanced that after collision of a Mars-sized impact with the Earth, collisions between debris particles themselves are able to place enough material into Earth orbit, to form the Moon. Collision probability estimates show that the collision frequency is high enough to place about one lunar mass into Earth orbit, if the average semimajor axis is of order of the Earth's Roche limit of 18 500 km.
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Horedt, G.P. A new variant of the large-impact hypothesis for the origin of the Moon. Earth Moon Planet 42, 201–206 (1988). https://doi.org/10.1007/BF00054547
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DOI: https://doi.org/10.1007/BF00054547