The Moon formed when an object collided with the proto-Earth. For years, scientists thought that in the aftermath, hydrogen and other so-called 'volatile elements' escaped and were lost to space. This would have led to a dry and volatile element-depleted Moon, which seemed to be consistent with previous analyses of lunar samples. But ongoing research about the Moon's chemistry is revealing that it may be wetter than initially thought, raising questions about this origin story.
via Science Daily
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