What key chemical observation shifted scientific perspective regarding Theia and Earth's material contribution?
Answer
The Moon appears strikingly similar in composition to Earth’s own mantle
If Theia had been entirely separate, the Moon should have a distinct isotopic signature. The observation that the Moon is compositionally similar to Earth's mantle suggests a thorough mixing or a similar initial composition between the two bodies.
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How Theia, the Planet that Created the Moon, Could Also Be Hiding ...
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