It's been half a century since the Apollo missions returned from the Moon, and yet the lunar samples they brought home continue to baffle us.
Researchers have previously entertained a new angle to the question, suggesting patches of the lunar surface wereIn this latest study, a duo from Stanford and Brown University in the US has proposed a model describing just how these short-lived but powerful fields might form.
In the first billion years or so of the Moon's existence, its core was not much hotter than the mantle above. This meant the heat from the Moon's interior didn't have anywhere to dissipate, which is what usually causes molten material to move. The lighter, hotter bits tend to rise until they cool, while the denser, colder bits sink until they heat, and so on, and so forth.
Titanium-rich rock, however, would have weighed more than the solids below, causing chunks near the Moon's crust to drop through the mantle, right into the core.Researchers think this sinking effect continued until at least 3.5 billion years ago, with at least a hundred blobs of titanium-rich material hitting 'rock bottom' in a billion years.
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