Earth's moon could have formed in just 5 hours after giant impact

Recent scientific findings indicate that the Moon may have formed in as little as five hours following a giant impact involving the planet Theia and proto-Earth. This discovery stems from a study that challenges previous models of lunar creation. While traditional simulations of the event occurred, this new research suggests a much more rapid assembly process than previously understood. The findings aim to provide a clearer understanding of the exact timing associated with the collision that created the Earth's natural satellite. Coverage of this development appears in Space Daily, Inshorts, and Space.

Space Daily emphasizes the technical shift in how these simulations are conducted, noting that classic models treated the colliding bodies as strengthless fluids. These older simulations typically resulted in a debris disk that assembled over a longer period. However, researchers from the Southwest Research Institute altered these parameters by incorporating temperature-dependent rock strength into their simulations, which led to the revised timeline of a five-hour formation period. To understand the significance of this shift, it is necessary to recognize the role of the planet Theia in the giant impact hypothesis. The interaction between Theia and the proto-Earth is the central event in the Moon's origin.

By moving away from the assumption that the colliding bodies acted as fluids and instead accounting for the physical strength of rock as it relates to temperature, the Southwest Research Institute has introduced a new variable that fundamentally changes the predicted speed of the moon's assembly from a slower disk process to a rapid event. Moving forward, the focus remains on how these findings will refine the broader timeline of the early solar system. According to Inshorts, the primary goal of this discovery is to help scientists learn the exact time of the collision between Theia and proto-Earth. Future analysis will likely continue to build upon the temperature-dependent rock strength models utilized by the Southwest Research Institute to further verify the rapid formation window and its implications for planetary science.