Lunar samples gathered by Apollo astronauts over 50 years ago are offering new insights into the moon’s enigmatic magnetic field, according to a recent report by scientists. The upcoming retrieval of samples by astronauts as part of NASA’s Artemis program is anticipated to provide further information. In a study conducted by researchers at the University of Oxford in England, it was revealed that the moon’s magnetic field, while historically weak, experienced periods of significant strength surpassing Earth’s magnetic activity billions of years ago for brief intervals. These findings have been published in the journal Nature Geoscience.
Magnetic fields play a crucial role in shielding against cosmic rays and solar radiation. The study suggests that the moon exhibited short-lived spikes in magnetic field strength, lasting up to 5,000 years, possibly due to the melting of titanium-rich rocks deep within the moon. Previous theories based on Apollo mission rock samples suggested prolonged periods of strong lunar magnetic fields. With Artemis astronauts set to explore the moon’s south pole instead of the regions visited during the Apollo missions, new samples are expected to provide further insights into the moon’s ancient magnetic properties.
Lead author Claire Nichols and her team analyzed earlier data from Apollo samples, discovering a correlation between high titanium levels and preserved evidence of elevated magnetic activity. Nichols emphasized the significance of this discovery, noting that magnetic field strength on the moon may fluctuate more than previously believed.
The researchers highlighted that the Apollo samples, collected from areas abundant in titanium due to volcanic activity, may not be fully representative of the moon’s overall composition. Future Artemis missions aim to investigate ancient rocks near the moon’s south pole, where water ice is believed to be present in permanently shadowed craters. Nichols emphasized the importance of understanding the moon’s magnetic history in relation to planetary habitability.