The lunar magma ocean would have occurred in the early millennia of the Moon’s formation. The presiding theory is that the Moon was formed after Earth was hit by a massive Mars-sized planet, causing rocks to burst out and eventually come together to form the Moon. It’s believed that the magma ocean would have lasted for tens to hundreds of millions of years after the Moon was initially formed.
Eventually, the lunar magma ocean would cool and create the ferroan anorthosite rocks that the rover sampled from the Moon’s soil recently. Of course, this is far from the first time the lunar magma ocean (LMO) model has been proposed, but these findings help to prove the theory. The LMO model was first proposed when the Apollo 11 mission brought back the samples.
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