![]() The polar hydrogen deposits have been mapped by orbiting neutron spectrometers, and their observed spatial distribution does not match the expected distribution of water ice inferred from present-day lunar temperatures. If the orientation of the Moon has changed, then the locations of the shadowed regions will also have changed. The hydrogen content of deposits near the lunar poles may yield insight into this history, because these deposits (which are probably composed of water ice) survive only if they remain in permanent shadow. The earliest dynamic and thermal history of the Moon is not well understood. Siegler, M A Miller, R S Keane, J T Laneuville, M Paige, D A Matsuyama, I Lawrence, D J Crotts, A Poston, M J Lunar true polar wander inferred from polar hydrogen.
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