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Home » Planetary Scientists Find Evidence of Solar-Driven Change on the Moon
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Planetary Scientists Find Evidence of Solar-Driven Change on the Moon

NewsBy NewsAugust 21, 2021Updated:August 21, 2021No Comments4 Mins Read0 Views
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PhD student discovers that solar radiation could be a more important source of lunar iron nanoparticles than previously thought.

Tiny iron nanoparticles unlike any found naturally on Earth are nearly everywhere on the Moon—and scientists are trying to understand why. A new study led by Northern Arizona University doctoral candidate Christian J. Tai Udovicic, in collaboration with associate professor Christopher Edwards, both of NAU’s Department of Astronomy and Planetary Science, uncovered important clues to help understand the surprisingly active lunar surface. In an article recently published in Geophysical Research Letters, the scientists found that solar radiation could be a more important source of lunar iron nanoparticles than previously thought.

Asteroid impacts and solar radiation affect the Moon in unique ways because it lacks the protective magnetic field and atmosphere that protect us here on Earth. Both asteroids and solar radiation break down lunar rocks and soil, forming iron nanoparticles (some smaller, some larger) that are detectable from instruments on satellites orbiting the Moon. The study used data from National Aeronautics and Space Administration (NASA) and Japan Aerospace Exploration Agency (JAXA) spacecraft to understand how quickly iron nanoparticles form on the Moon over time.

“We have thought for a long time that the solar wind has a small effect on lunar surface evolution, when in fact it may be the most important process producing iron nanoparticles,” Tai Udovicic said. “Since iron absorbs a lot of light, very small amounts of these particles can be detected from very far away – making them a great indicator of change on the Moon.”

Metallic Iron Abundance on Moon

Iron nanoparticles on the Moon increase in abundance over time, but differ based on their size. Larger iron nanoparticles were found in higher abundances but seem to form slower overall than the smaller iron nanoparticles. Credit: Northern Arizona University

Surprisingly, the smaller iron nanoparticles seemed to form at a similar rate as radiation damage in samples returned from the Apollo missions to the Moon, a hint that the Sun has a strong influence in their formation.

“When I saw the Apollo sample data and our satellite data side by side for the first time, I was shocked,” Tai Udovicic said. “This study shows that the solar radiation could have a much larger influence in active change on the Moon than previously thought, not only darkening its surface, but it might also create small quantities of water usable in future missions.”

As NASA prepares to land the first woman and the next man on the surface of the Moon by 2024 as part of the Artemis mission, understanding the solar radiation environment and possible resources on the Moon are critical. In future work recently awarded a NASA Future Investigators in Space Science and Technology (FINESST) grant, Tai Udovicic plans to broaden his targeted study to the entire Moon, but is also eager to take a closer look at mysterious lunar swirls, one of which was recently selected as a landing site for the upcoming Lunar Vertex rover. He also studies lunar temperatures and water ice stability to inform future missions.

“This work helps us understand, from a bird’s eye view, how the lunar surface changes over time,” said Tai Udovicic. “While there is still a lot to learn, we want to make sure that when we have boots back on the Moon, that those missions are backed by the best science available. It’s the most exciting time to be a lunar scientist since the tail end of the Apollo era in the 70s.”

Reference: “New Constraints on the Lunar Optical Space Weathering Rate” by C. J. Tai Udovicic, E. S. Costello, R. R. Ghent and C. S. Edwards,19 June 2021 , Geophysical Research Letters.
DOI: 10.1029/2020GL092198

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