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Nature 409, 691-692 (8 February 2001) | doi:10.1038/35055507;
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Measurement of stellar age from uranium decay
The ages of the oldest stars in the Galaxy indicate when star formation began, and provide a minimum age for the Universe. Radioactive dating of meteoritic material and stars relies on comparing the present abundance ratios of radioactive and stable nuclear species to the theoretically predicted ratios of their production.
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