Lunar soil reads as a cosmic time capsule for exploding stars

A new study suggests that lunar soil can be read as a cosmic time capsule for exploding stars. The research, led by Emily Costello of the University of Hawai'i at Mānoa, developed a mathematical model to decode the history recorded in the lunar surface. The model accounts for the complex process of impact gardening, which scrambles the moon's surface soil due to meteorite impacts. The study found that the lunar regolith preserves information about interstellar debris for up to 80–100 million years, offering a unique opportunity to reconstruct the history of the solar system's journey through the galaxy. The model validated using real-world data showed that it accurately predicts the depth-concentration profiles of iron-60 found in Apollo regolith samples.

The team extended their model to predict how other heavy elements, such as plutonium-244, iodine-129, hafnium-182, and curium-247, are buried over time. The model successfully reproduced depth-concentration profiles of radioisotopes from Apollo core samples, validating its ability to capture the effects of supernova explosions. The study highlights the potential for future lunar sample collection to reveal new insights into supernova history. The research provides a framework for understanding how interstellar debris is preserved in lunar soil, offering guidance for future space missions.

The study is published in the journal Physical Review Letters. The research team validated their model using data from deep-sea sediments and Apollo samples, demonstrating the model's accuracy in predicting the distribution of radioactive isotopes. The findings suggest that the moon's soil acts as a long-term archive of cosmic events, allowing scientists to reconstruct the history of stellar explosions. The research underscores the importance of understanding the physical processes that govern the mixing and preservation of lunar soil, which could have implications for future space exploration and the study of cosmic history.

AI-generated summary of the original article — see the source for the full story.