The Saga of 3He

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Science  01 Feb 2002:
Vol. 295, Issue 5556, pp. 804-805
DOI: 10.1126/science.1069134

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He is one of the few isotopes that were created in the Big Bang. It can therefore provide clues about the earliest processes in the universe. But as Rood et al. explain in their Perspective, detecting and interpretingHe signatures can be difficult both in space and on Earth because there are multiple sources for the isotope. The next generation of radio telescopes should be able to provideHe data of sufficient accuracy to constrain models of the chemical evolution of our galaxy.