The moon could have formed in just a few hours.

Scientists simulated the appearance of the moon as a result of the collision of the Earth with a large celestial body. It turned out that the natural satellite of our planet could be formed in just a few hours. The new model showed that after the impact, two clumps of ejected matter appeared in near-Earth orbit - from both planets. Thanks to gravity, the larger one quickly pushed the smaller one into a more distant and stable orbit. At the same time, he himself remained below the Roche limit and collapsed.