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Assuming that hydrogen fusion requires
the Universe to have a temperature of
T > 10' K (as measured by the CMB),
determine the redshift at which the
fusion of hydrogen into helium was just
possible as the Universe expanded and
cooled. Choose the option below that
most closely matches your answer.
Select one:
Оа.
4000.87
b.
3669723.77
О с
2229723.71
O d. 9748293.14
O e.
4669723.16

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