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Using a instrument-laden probe, Kaguya, which was placed in orbit around the Moon in 2007, the team found abundant signatures of the mineral in concentric rings in three big crater regions.
A leading theory is that the Moon was created about 4.5 billion years ago after the "Big Whack" -- it was ripped from Earth after our planet suffered a gigantic collision from some space object. As the material coalesced into a ball, its surface gradually cooled, forming a crust made of a light-coloured aluminous mineral, feldspar, which floated in a dense, molten liquid. Kaguya's data add a chapter to this "lunar magma ocean" hypothesis.