Moon Formed in 5 Hours
Scientists at Southwest Research Institute and University of Arizona reveal giant impact formed intact moon in record time using new computational techniques
A giant impact could have formed an intact moon within five hours, according to simulations by the Southwest Research Institute (SwRI) and the University of Arizona. The research, published in The Astrophysical Journal Letters, used state-of-the-art computational techniques to model the material strength of the colliding planets.
The simulations suggest that the preexisting geology of the Mars-sized proto-moon plays a crucial role in the formation of the moon. Dr. Adeene Denton, a postdoctoral researcher at SwRI, said that incorporating the material strength of the colliding bodies changes how the moon forms out of the impact.
Earlier studies of the giant impact scenario, including a 2001 paper by Dr. Robin Canup and Dr. Erik Asphaug, ignored material strength in their simulations. However, the new simulations incorporated temperature-dependent geologic strength for the first time, finding that moon formation is sensitive to the temperatures of the colliding bodies.
The team found that some scenarios produce a fully intact moon within hours of the impact, while others produce a protolunar disk around Earth that ultimately forms the moon. This new understanding of moon formation could change how researchers understand the Earth-moon system and may help constrain the timing of the event.
## Why it matters The formation of the moon is a complex and still-unresolved question in the field of astrophysics. The new simulations provide a fresh perspective on the giant impact hypothesis, which suggests that the moon was formed from debris left over after a massive collision between Earth and a Mars-sized object called Theia. The research has significant implications for our understanding of the early solar system and the formation of celestial bodies.
The new findings highlight the importance of considering the material strength of colliding bodies in simulations of moon formation. By incorporating temperature-dependent geologic strength, the researchers were able to create more realistic models of the impact and its aftermath. The results of the study will likely be of interest to scientists and researchers in the field of astrophysics, and may lead to further investigation into the formation of the moon and the early solar system.
