Hidden deep in ancient rocks, scientists have found the surviving traces of Earth’s first form—unchanged for 4.5 billion ...
Space.com on MSN
Scientists open untouched Apollo 17 lunar samples from 1972 — they may hold clues about the moon's violent origins
The isotopic ratio of sulfur-33 on the moon differs from that of Earth. Did the moon's sulfur instead come from the impactor that formed it?
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