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It is often claimed that the abundances of the light elements predicted by the big bang model match the measured abundances of those elements, and hence constitute evidence for the big bang. However, the actual abundances of the two isotopes of lithium depart significantly from big bang model predictions. The discrepancy is so great that scientists term this the primordial lithium problem. Therefore, rather than providing good evidence for the big bang model, the abundances of the light elements represents a significant problem for the standard cosmology.
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