According to National Geographic article published in June 2019, a huge mystery blob was found under the moon's far side by NASA's Lunar Reconnaissance Orbiter.
Scientists will be able to better understand how all rocky bodies came to be thanks to this discovery.
Full article can be seen at: https://www.nationalgeographic.com/science/2019/06/massive-blob-discovered-moon-surface
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Topographical Moon Desktop Globe by ST, Item # STMNGLB
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