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Apollo samples brought to Earth in 1972 reveal exotic sulfur hidden in Moon’s mantle, with isotopic ratios dramatically different compared to Earth's. One possible explanation is it could belong to the planet Theia that is hypothesized to have collided with the early Earth to form the Moon


Sealed Apollo 17 samples analyzed with new techniques reveal that the Moon’s interior contains sulfur isotopes unlike those found on Earth, according to research led by a Brown University scientist.

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