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Except now we see more water. Clearly something is amiss. To be honest, I think the Giant Impact Hypothesis is still the best thing going — it really does have a lot of explanatory power — but it looks like we missed something.
A team of scientists on NASA’s Lunar Reconnaissance Orbiter (LRO) mission claim that their new neutron mapping shows that locations of high hydrogen content are not well correlated with dark areas near the poles of the Moon.