Using a small device called the Miniature Radio Frequency (Mini-RF) instrument attached to NASAs Lunar Reconnaissance Orbiter (LRO) spacecraft, a team of scientists found that there may be vastly more subsurface metals beneath the Moons surface than previously thought.
The discovery could force us to rethink the evolution of the Moon itself. The dominant theory is currently that a collision between a Mars-sized space object and the Earth sheered off the Moon as a result of collapsing gravitational forces clumping dust and debris together.
The theory has often been used to explain why the Moons composition is so similar to Earths. But in reality, the material making up the lunar highlands, a bright silicate layer covering more than 80 percent of the moon, seemed to contain far fewer metal-bearing minerals than what youd find on Earth.
But darker regions and plains of the crust formed through volcanic processes, the Moons maria, seem to be more metal-rich which has researchers scratching their heads.
The Mini-RF instrument on board NASAs Moon orbiter found that the larger the crater, the more the material was able to transmit electric fields, a property known as the dielectric constant. Scientists have found a direct link between this constant andthe concentration of metal minerals including iron and titanium oxides. Yet, for craters between three and 12 miles wide, this constant didnt change.
It was a surprising relationship that we had no reason to believe would exist, Essam Heggy, co-investigator of the Mini-RF experiments from the University of Southern California and lead author of the paper published in Earth and Planetary Science Letters last week, said in a statement.
Their hypothesis: meteors excavated metals from below as they battered the lunar surface, forming the craters in the process. That would mean there would be vast caches of useful metals lurking below a few hundred meters of Moon rock.
In fact, the lower wed dig, the more iron and titanium oxides wed find, according to the researchers.
That thinking echoes research releasedin June 2019 that suggests there is a huge mass of metal hiding beneath the Moons four billion years-old South Pole-Aitken basin.
Imagine taking a pile of metal five times larger than the Big Island of Hawaii and burying it underground, Peter B. James, author of the paper, said in apress release. Thats roughly how much unexpected mass we detected.
This exciting result from Mini-RF shows that even after 11 years in operation at the Moon, we are still making new discoveries about the ancient history of our nearest neighbor, Noah Petro, LRO project scientist at NASAs Goddard Space Flight Center, who was not involved in the research, said in the newer statement.
The MINI-RF data is incredibly valuable for telling us about the properties of the lunar surface, but we use that data to infer what was happening over 4.5 billion years ago! Petro added.
READ MORE: Theres more metal on the moon than we thought [Space.com]
More on metal on the Moon: Scientists Are Baffled by Huge Mass Under the Moons Surface
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NASA Discovers Huge Potential Caches of Metal On the Moon - Futurism
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