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Deuterium Levels in Comets Reveal Clues About the Early Solar System
Comets, once seen as omens in ancient cultures, are now studied as time capsules of the early Solar System. Composed of dirty balls of ice and rock that scatter dust and gases as they travel, they carry deuterium — a hydrogen isotope — whose ratios tell scientists about conditions in the primitive solar nebula. Measuring deuterium in comets helps astronomers trace the origins of water and organic material in the Solar System.
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