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Moon Formed in Hours, Not Eons?
14 Sep
Summary
- New simulations suggest the moon formed almost instantly after a giant impact.
- The moon's formation speed depends on Earth and Theia's initial temperature.
- Similar compositions of Earth and moon remain a persistent mystery.
Recent computer simulations indicate that the moon might have formed almost instantaneously after a colossal impact, rather than gradually from a debris disk. This groundbreaking work suggests that under specific conditions, the entire moon could have coalesced within approximately five hours following the ancient collision.
The key factor influencing this rapid formation is the geological properties of the colliding planets, particularly their temperature. Earlier models assumed that such a violent impact would melt all material, treating the bodies as fluids. However, the new research incorporates the strength of solid rock, revealing that initial temperatures of Earth and the impactor, Theia, play a crucial role.
Hotter initial temperatures can lead to a faster, intact moon formation, while cooler conditions favor the traditional slower debris disk accretion model. Despite these new insights into the mechanics of lunar birth, a persistent mystery remains: why Earth and the moon share nearly identical compositions, a puzzle that this latest research may help to eventually solve.
