3 ms·

> These processes can and do happen terrestrially. ... and at rates that mean that the amount of non-big-bang hydrogen is not even a trillionth of a trillionth

• rimunroe 1y ago
  > the amount of non-big-bang hydrogen is not even a trillionth of a trillionth of the total. I didn't say it was a huge fraction of the total. You said "literally all of them" were from the Big Bang, which is just wrong. Plenty of other processes produce protons/hydrogen