Add Yahoo as a preferred source to see more of our stories on Google. The Apollo missions landing sites had a few things in common. (Credit: NASA) Collecting samples to support good, reliable science ...
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The Mars-sized object that created our moon may have been more iron-rich than suspected, study finds
About 4.5 billion years ago, a Mars-sized object, named Theia, slammed into a proto-Earth to create the Moon.
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