What is the reason that any free deuterium detected in the cosmos must be primordial in origin?

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    Deuterium can be created only in the first stages of formation of galaxies.
     Deuterium is not created in the nucleosynthesis processes that take place in stars.
     Deuterium can only be created by the process responsible for the decoupling of the cosmic background radiation.
     Deuterium can only be created by the breakup of helium nuclei that takes place in the black holes that power the cores of distant quasars.
     Deuterium can only be created by the processes that occurred during the earliest "Planck" era of quantum gravity after the Big Bang.
asked Sep 20, 2012 in Astronomy by anonymous
    

1 Answer

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Deuterium is not created in the nucleosynthesis processes that take place in stars.
answered Sep 22, 2012 by SkyStar ~Expert~ (2,855 points)

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