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The discovery may force scientists to rethink the lunar past and future, although uncertainty remains about how much water exists and whether future explorers could extract it.
"This really appears to have changed the rules of the game," said Robin Canup, astrophysicist and director of the Southwest Research Institute in Boulder, Colo., who was not part of the team that made the discovery.
"If there was a lot of water in the early moon, then that is new for sure," said Ben Bussey, a planetary scientist at the Johns Hopkins University Applied Physics Laboratory who also was not involved in the new study.
"I thought that if we were really lucky we would get to see it," said Alberto Saal, a geochemist at Brown University and lead author on the Nature study.