Dates of lunar impacts refined

ENN
Oct 16, 2015, 5:51 pm33 pts
Phenomenally durable crystals called zircons are used to date some of the earliest and most dramatic cataclysms of the solar system. One is the super-duty collision that ejected material from Earth to form the moon roughly 50 million years after Earth formed. Another is the late heavy bombardment, a wave of…

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