I know there is around $10^{80}$ atoms in the observable universe, but is there any estimate the amount of lead in the universe (within a couple magnitudes of $10$)?

  • 1
    $\begingroup$ Are you worried about being poisoned? $\endgroup$
    – Ron Maimon
    Sep 24, 2011 at 2:08
  • $\begingroup$ No, actually, I am wondering whether the amount of lead is merely small (less than 1 / 10^3) or vanishingly rare (less than 1 / 10^60) $\endgroup$
    – donnyton
    Sep 24, 2011 at 2:16
  • 1
    $\begingroup$ The estimated fraction of lead atoms in the universe is $6\cdot10^{-11}$. $\endgroup$
    – mmc
    Sep 24, 2011 at 2:59
  • $\begingroup$ @mmc: why not post as an answer? Also: does this belong on Astronomy? $\endgroup$
    – David Z
    Sep 24, 2011 at 3:45
  • 1
    $\begingroup$ @mmc: fair enough, I understand the reluctance to post a very short answer... but I think that if you have an answer, as long as it really does answer the question, even if it is very short, it's better to post it as an answer than as a comment. $\endgroup$
    – David Z
    Sep 24, 2011 at 4:15

1 Answer 1


The estimated fraction of lead atoms in the universe is $6 \times 10^{−11}$.

  • 1
    $\begingroup$ Alpha is only giving molar abundance, not atomic abundance. Link rot? $\endgroup$
    – Mark
    Oct 24, 2017 at 22:04

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.