Researchers have traced chemical clues in rocks from Earth and the Moon to uncover the origins of Theia, the body that struck Earth billions of years ago. About 4.5 billion years ago, a colossal impact between the young Earth and a mysterious planetary body called Theia changed everything—reshaping Earth, forming the Moon, and scattering clues across space rocks. By examining subtle isotopic fingerprints in Earth and Moon samples, scientists have reconstructed Theia’s possible composition and birthplace.
Reconstructing Theia’s makeup: A new study in Science identifies t...
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