And it explains its tiny core: Since the models suggest that all of the impactor's core wound up in the Earth's core, the moon must have got its core iron from later, smaller impacts.
(the models; suggest; ) (all of the impactor's core; wound up; in the Earth's core) (it; explains; its tiny core) Context(it explains,List([4, 15))):(the moon; must have got; its core iron)
it explains,List([4, 15))
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its core iron