What evidence addresses the long-standing puzzle regarding Moon and Earth isotope similarities?
Answer
Theia and Earth formed in the same local orbital environment
A major question in planetary science was why the Moon and Earth share nearly identical isotopic compositions despite the Moon originating from an external impactor. The evidence shows that Theia was a neighbor that formed in the same local orbital environment as Earth. Because they drew from the same feed of planetary material, they possessed the same chemical fingerprints. This explains why the debris disk was a homogeneous mixture, resulting in a Moon that appears geochemically similar to the Earth's own mantle.
#Videos
What was Theia like? - YouTube
Theia: When the Earth Destroyed its Sibling Planet | Netflix - YouTube
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