cst commonsense

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Since Hydrogen (protons) were nearly all created just after the big bang - does this mean every hydrogen atom within us is 13.5 bn yrs old?

Just the astrophysics really - should be correct assumption as hydrogen (and helium) were the start point of all other elements then formed within stars. There must be a little hydrogen formed as a by product of atomic reactions (fission and fussion) but this I expect must be a tiny proportion of the total still left.
JP

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    Sep 27 2012: actually depends on what do you mean by hydrogen atom. the nucleus is i guess likely to be 13bn years old. the electron ... not so sure. and the two constantly gets separated and then form pairs again with different partner. in the body, hydrogen is chemically bound, so it is not even clear which electron belongs to the hydrogen and which to the oxygen or carbon or other atom.
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      Oct 1 2012: Good point, so lets just say all the protons within us (and then there is a lot more, clearly), so that would mean a highish proportion of our (human) matter is 13bn years old - if I could remember avogadro's number then I could probably work out the approx percentage : )
      Cheers
      JP
      • Oct 1 2012: A proton is ~1000 times heavier than an electron. There is one of each in a hydrogen atom.
  • Sep 23 2012: Most of them at the very least, and that's quite interesting. Also, since our atoms were formed in the bellies of stars, we are not only formed from stardust. Our atoms have been in places that our most extravagant travels will never match.
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      Sep 27 2012: Thanks Gabo.... interesting thought - strange that it is not more widely spoken about ... also being made from the first 'atoms' from the big bang I think is more than a little bit amazing.
      JP
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    Sep 20 2012: From my understanding, energy can neither be created or destroyed. And since everything is just a infinite form of energy then there is no such thing as time. Time is a human idea. Not a environmental idea. Every mammal lives for the same amount of "time" if you count by heart beats instead of seconds. 1.6 billion heart beats and everything dies. The only reason there is a difference in time is the rate of which the heart beats. So to you question I would say yes and no.

    http://beholders.org/mind/scienceandfacts/124-1billionheartbeats.html
    • Sep 27 2012: Matter can be destroyed (converted into energy) and small animals do have faster beating hearts but the number of heartbeats in an animal's life is by no means equal for all species. Lastly, this all has very little to do with the orginal question, to which the answer is: yes, most hydrogen atoms are more than 13 billion years old.
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        Sep 28 2012: Good day John,

        I thought I answered with the yes that it is 13 billion years old. However it is only that old do to the measurement of the earths rotation around our specific sun. Which is why I said that time is a human idea. For if we used the rotation around a different sun or not even a sun at all, then it could be 14 billion years old or 6 billion years old or really any years old for that matter.
        • Sep 28 2012: "For if we used the rotation around a different sun or not even a sun at all, then it could be 14 billion years old or 6 billion years old or really any years old for that matter."

          I think we can assume the OP was thinking in terms of Earth years which can be expressed in physical constants so even an alien would know how much time we're talking about.
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        Sep 29 2012: Why does an alien need to know how long the earth has been around? And how would we "sync" years. So Alien is like yeah our planet where we are from is 2 (define obscure label that could represent anything we want) And we'd go oh ok because that universal
        • Oct 1 2012: You keep making things way too difficult for yourself...
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        Oct 1 2012: Last time I check this world was not only difficult to live in but to also understand, so why make it so easy. All that leads to is over weight people, which you could put me in that category, and enslavement.