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A newly published study notes that the moon is "rusting," leaving experts perplexed by the discovery.

The research, published in Science Advances, notes that the rust may be a result of water discovered on the moon, but it's still shocking, given the lack of oxygen and dearth of water on Earth's celestial satellite.

"It's very puzzling," the study's lead author, Shuai Li of the University of Hawaii, said in a statement. "The moon is a terrible environment for hematite to form in."

Li was looking at data from the JPL Moon Mineralogy Mapper when the researcher realized the instrument detected "spectra - or light reflected off surfaces - that revealed the Moon's poles had a very different composition than the rest of it," the statement added.

The polar surfaces showed spectra that matched the mineral hematite (Fe2O3), according to the study's abstract.

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