Speaking of fusion: hot, cold, warm, or whatever - there is a misperception.
It is worth noting that 99+% of all of the known nuclear reactions
throughout the Universe, which occur continuously in stars, are short-lived
reactions with no net gain:
P+P -> 2He -> P+P
That is the unequivocal implication of the standard model. On extremely rare
occasions, there will be a beta decay of the newly-fused helium isotope
before it decays back to protons... and on even rarer occasions, the
deuterium formed from beta decay will fuse with another proton, to stable
helium ... and then ... after billions of years of almost no-net-gain per
reaction (percentage-wise) there will be a final nova/supernova event - with
its massive gain in a short time frame - but even this event does not change
the overall percentage of "zero-gain nuclear reactions" very much, at least
not enough to be significant to 10 decimal places - when considered in the
context of time.
Thus we can opine that Ni-H on earth is not all that "cold" ... especially
in the context of its comparatively short parameter for net energy release,
compared to the solar model ...
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