The Moon Was an Inside Job

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By Robin George Andrews, The New York Times. 

Excerpt: New research suggests that Theia, the object whose collision with Earth is theorized to have caused the formation of the moon, came from closer to the sun. ...A study published Thursday in the journal Science ...looking at chemical clues hidden in Earth’s rocks, meteorites and moon matter, scientists have found ghostly remnants of Theia. And they show that Theia and the early Earth were built from the same construction materials.... 

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