Why is there so much iron?Origin of elements heavier than Iron (Fe)What happens to the neighboring star of a type Ia supernova?What examples are there of fuzzy concepts in astronomy?How much iron would I have to shoot into the Sun to blow it up?Possible intergalactic celestial objectsWhat prevents a star from collapsing after stellar death?Type II supernovae explosionsWhat causes a supernova explosion?Why does a star with its core collapsing and about to undergo a supernova, explode, instead of rapidly collapsing all of its matter into a black hole?Could the singularity of a black hole just be an iron / dark matter sphere?

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Why is there so much iron?


Origin of elements heavier than Iron (Fe)What happens to the neighboring star of a type Ia supernova?What examples are there of fuzzy concepts in astronomy?How much iron would I have to shoot into the Sun to blow it up?Possible intergalactic celestial objectsWhat prevents a star from collapsing after stellar death?Type II supernovae explosionsWhat causes a supernova explosion?Why does a star with its core collapsing and about to undergo a supernova, explode, instead of rapidly collapsing all of its matter into a black hole?Could the singularity of a black hole just be an iron / dark matter sphere?













13












$begingroup$


We all know where iron comes from. But as I am reading up on supernovas it got me wondering why there is as much iron as there is in the universe?



Brown dwarfs do not deposit iron.



White dwarfs do not deposit iron.



Type I supernovas leave no remnant so I can see where there would be iron released.



Type II leave either a neutron star or black hole. As I understand it, the iron ash core collapses and the shock wave blows the rest of the star apart. Therefore no iron is released. (I know some would be made in the explosion along with all of the elements up to uranium. But would that account for all of the iron in the universe?)



Hypernovas will deposit iron, but they seem to be really rare.



Do Type I supernovas happen so frequently that iron is this common? Or am I missing something?










share|cite|improve this question











$endgroup$







  • 7




    $begingroup$
    Therefore no iron is released. are you sure?
    $endgroup$
    – Kyle Kanos
    23 hours ago










  • $begingroup$
    I know some would be made in the explosion along with all of the elements up to uranium. But would that account for all of the iron in the universe? (I was thinking that the amount of iron being made during the compression of the rest of the star could not account for all of the iron in the universe...) Type II's do not seem to happen that often....do they?
    $endgroup$
    – Rick
    23 hours ago







  • 2




    $begingroup$
    This table in Wikipedia's "Nucleosynthesis" article might help, detailed here.
    $endgroup$
    – Nat
    23 hours ago











  • $begingroup$
    Your duplicate sir (though one must rephrase the question a little) chemistry.stackexchange.com/questions/40407/… In short: the Iron nucleus is the most stable - so thankfully, there's actually not THAT much in the universe else we'd be getting very close to the heat death.
    $endgroup$
    – UKMonkey
    7 hours ago











  • $begingroup$
    I would disagree with you... There is a LOT of iron, almost as much as Oxygen and Carbon (as well as silicon)...en.wikipedia.org/wiki/Nucleosynthesis#/media/…
    $endgroup$
    – Rick
    2 hours ago















13












$begingroup$


We all know where iron comes from. But as I am reading up on supernovas it got me wondering why there is as much iron as there is in the universe?



Brown dwarfs do not deposit iron.



White dwarfs do not deposit iron.



Type I supernovas leave no remnant so I can see where there would be iron released.



Type II leave either a neutron star or black hole. As I understand it, the iron ash core collapses and the shock wave blows the rest of the star apart. Therefore no iron is released. (I know some would be made in the explosion along with all of the elements up to uranium. But would that account for all of the iron in the universe?)



Hypernovas will deposit iron, but they seem to be really rare.



Do Type I supernovas happen so frequently that iron is this common? Or am I missing something?










share|cite|improve this question











$endgroup$







  • 7




    $begingroup$
    Therefore no iron is released. are you sure?
    $endgroup$
    – Kyle Kanos
    23 hours ago










  • $begingroup$
    I know some would be made in the explosion along with all of the elements up to uranium. But would that account for all of the iron in the universe? (I was thinking that the amount of iron being made during the compression of the rest of the star could not account for all of the iron in the universe...) Type II's do not seem to happen that often....do they?
    $endgroup$
    – Rick
    23 hours ago







  • 2




    $begingroup$
    This table in Wikipedia's "Nucleosynthesis" article might help, detailed here.
    $endgroup$
    – Nat
    23 hours ago











  • $begingroup$
    Your duplicate sir (though one must rephrase the question a little) chemistry.stackexchange.com/questions/40407/… In short: the Iron nucleus is the most stable - so thankfully, there's actually not THAT much in the universe else we'd be getting very close to the heat death.
    $endgroup$
    – UKMonkey
    7 hours ago











  • $begingroup$
    I would disagree with you... There is a LOT of iron, almost as much as Oxygen and Carbon (as well as silicon)...en.wikipedia.org/wiki/Nucleosynthesis#/media/…
    $endgroup$
    – Rick
    2 hours ago













13












13








13


1



$begingroup$


We all know where iron comes from. But as I am reading up on supernovas it got me wondering why there is as much iron as there is in the universe?



Brown dwarfs do not deposit iron.



White dwarfs do not deposit iron.



Type I supernovas leave no remnant so I can see where there would be iron released.



Type II leave either a neutron star or black hole. As I understand it, the iron ash core collapses and the shock wave blows the rest of the star apart. Therefore no iron is released. (I know some would be made in the explosion along with all of the elements up to uranium. But would that account for all of the iron in the universe?)



Hypernovas will deposit iron, but they seem to be really rare.



Do Type I supernovas happen so frequently that iron is this common? Or am I missing something?










share|cite|improve this question











$endgroup$




We all know where iron comes from. But as I am reading up on supernovas it got me wondering why there is as much iron as there is in the universe?



Brown dwarfs do not deposit iron.



White dwarfs do not deposit iron.



Type I supernovas leave no remnant so I can see where there would be iron released.



Type II leave either a neutron star or black hole. As I understand it, the iron ash core collapses and the shock wave blows the rest of the star apart. Therefore no iron is released. (I know some would be made in the explosion along with all of the elements up to uranium. But would that account for all of the iron in the universe?)



Hypernovas will deposit iron, but they seem to be really rare.



Do Type I supernovas happen so frequently that iron is this common? Or am I missing something?







astrophysics astronomy






share|cite|improve this question















share|cite|improve this question













share|cite|improve this question




share|cite|improve this question








edited 10 hours ago









Jens

2,40611431




2,40611431










asked 23 hours ago









RickRick

51612




51612







  • 7




    $begingroup$
    Therefore no iron is released. are you sure?
    $endgroup$
    – Kyle Kanos
    23 hours ago










  • $begingroup$
    I know some would be made in the explosion along with all of the elements up to uranium. But would that account for all of the iron in the universe? (I was thinking that the amount of iron being made during the compression of the rest of the star could not account for all of the iron in the universe...) Type II's do not seem to happen that often....do they?
    $endgroup$
    – Rick
    23 hours ago







  • 2




    $begingroup$
    This table in Wikipedia's "Nucleosynthesis" article might help, detailed here.
    $endgroup$
    – Nat
    23 hours ago











  • $begingroup$
    Your duplicate sir (though one must rephrase the question a little) chemistry.stackexchange.com/questions/40407/… In short: the Iron nucleus is the most stable - so thankfully, there's actually not THAT much in the universe else we'd be getting very close to the heat death.
    $endgroup$
    – UKMonkey
    7 hours ago











  • $begingroup$
    I would disagree with you... There is a LOT of iron, almost as much as Oxygen and Carbon (as well as silicon)...en.wikipedia.org/wiki/Nucleosynthesis#/media/…
    $endgroup$
    – Rick
    2 hours ago












  • 7




    $begingroup$
    Therefore no iron is released. are you sure?
    $endgroup$
    – Kyle Kanos
    23 hours ago










  • $begingroup$
    I know some would be made in the explosion along with all of the elements up to uranium. But would that account for all of the iron in the universe? (I was thinking that the amount of iron being made during the compression of the rest of the star could not account for all of the iron in the universe...) Type II's do not seem to happen that often....do they?
    $endgroup$
    – Rick
    23 hours ago







  • 2




    $begingroup$
    This table in Wikipedia's "Nucleosynthesis" article might help, detailed here.
    $endgroup$
    – Nat
    23 hours ago











  • $begingroup$
    Your duplicate sir (though one must rephrase the question a little) chemistry.stackexchange.com/questions/40407/… In short: the Iron nucleus is the most stable - so thankfully, there's actually not THAT much in the universe else we'd be getting very close to the heat death.
    $endgroup$
    – UKMonkey
    7 hours ago











  • $begingroup$
    I would disagree with you... There is a LOT of iron, almost as much as Oxygen and Carbon (as well as silicon)...en.wikipedia.org/wiki/Nucleosynthesis#/media/…
    $endgroup$
    – Rick
    2 hours ago







7




7




$begingroup$
Therefore no iron is released. are you sure?
$endgroup$
– Kyle Kanos
23 hours ago




$begingroup$
Therefore no iron is released. are you sure?
$endgroup$
– Kyle Kanos
23 hours ago












$begingroup$
I know some would be made in the explosion along with all of the elements up to uranium. But would that account for all of the iron in the universe? (I was thinking that the amount of iron being made during the compression of the rest of the star could not account for all of the iron in the universe...) Type II's do not seem to happen that often....do they?
$endgroup$
– Rick
23 hours ago





$begingroup$
I know some would be made in the explosion along with all of the elements up to uranium. But would that account for all of the iron in the universe? (I was thinking that the amount of iron being made during the compression of the rest of the star could not account for all of the iron in the universe...) Type II's do not seem to happen that often....do they?
$endgroup$
– Rick
23 hours ago





2




2




$begingroup$
This table in Wikipedia's "Nucleosynthesis" article might help, detailed here.
$endgroup$
– Nat
23 hours ago





$begingroup$
This table in Wikipedia's "Nucleosynthesis" article might help, detailed here.
$endgroup$
– Nat
23 hours ago













$begingroup$
Your duplicate sir (though one must rephrase the question a little) chemistry.stackexchange.com/questions/40407/… In short: the Iron nucleus is the most stable - so thankfully, there's actually not THAT much in the universe else we'd be getting very close to the heat death.
$endgroup$
– UKMonkey
7 hours ago





$begingroup$
Your duplicate sir (though one must rephrase the question a little) chemistry.stackexchange.com/questions/40407/… In short: the Iron nucleus is the most stable - so thankfully, there's actually not THAT much in the universe else we'd be getting very close to the heat death.
$endgroup$
– UKMonkey
7 hours ago













$begingroup$
I would disagree with you... There is a LOT of iron, almost as much as Oxygen and Carbon (as well as silicon)...en.wikipedia.org/wiki/Nucleosynthesis#/media/…
$endgroup$
– Rick
2 hours ago




$begingroup$
I would disagree with you... There is a LOT of iron, almost as much as Oxygen and Carbon (as well as silicon)...en.wikipedia.org/wiki/Nucleosynthesis#/media/…
$endgroup$
– Rick
2 hours ago










4 Answers
4






active

oldest

votes


















19












$begingroup$

The solar abundance of iron is a little bit more than a thousandth by mass. If we assume that all the baryonic mass in the disc of the Galaxy (a few $10^10$ solar masses) is polluted in the same way, then more than 10 million solar masses of iron must have been produced and distributed by stars.



A type Ia supernova results in something like 0.5-1 solar masses of iron (via decaying Ni 56), thus requiring about 20-50 million type Ia supernovae to explain all the Galactic Fe.



Given the age of the Galaxy of 10 billion years, this requires a type Ia supernova rate of one every 200-500 years.



The rate of type Ia supernovae in our Galaxy is not observationally measured, though there have likely been several in the last 1000 years. The rate above seems entirely plausible and was probably higher in the past.






share|cite|improve this answer









$endgroup$








  • 1




    $begingroup$
    On an important side note: Iron has one of the largest nuclear binding energies (See en.wikipedia.org/wiki/…). So eventually, the percentage of iron in the universe will increase with time, as it is a stable end-product of both nuclear fusion and nuclear decay.
    $endgroup$
    – Robert Tausig
    10 hours ago










  • $begingroup$
    @RobertTausig doesn't iron have THE largest nuclear binding energy (rather than just "one of the largest")?
    $endgroup$
    – N. Steinle
    3 hours ago










  • $begingroup$
    Rob, I like your answer. Perhaps it could be even better if you include an approximate rate of double neutron star mergers (which of course the rate is very uncertain but we know that such mergers produce lots of heavy elements) ? Such a NS-NS rate is expected to be at least on the same order as that of supernovae.
    $endgroup$
    – N. Steinle
    3 hours ago






  • 2




    $begingroup$
    @N.Steinle The Q asks whether type Ia supernovae can be responsible for all the iron. Neutron star mergers do not produce iron. Iron does have "one of the largest" binding energies per nucleon. It is not the largest. That would be Ni 62.
    $endgroup$
    – Rob Jeffries
    2 hours ago



















6












$begingroup$

Iron comes from exploding white dwarfs and exploding massive stars(Wikipedia).




enter image description here
Image source

Periodic table showing the cosmogenic origin of each element. Elements from carbon up to sulfur may be made in small stars by the alpha process. Elements beyond iron are made in large stars with slow neutron capture (s-process), followed by expulsion to space in gas ejections (see planetary nebulae). Elements heavier than iron may be made in neutron star mergers or supernovae after the r-process, involving a dense burst of neutrons and rapid capture by the element.







share|cite|improve this answer











$endgroup$












  • $begingroup$
    While this may answer the question, it is preferable to have the content of the link copied into the post to avoid issues such s link rot, going off-site, etc.
    $endgroup$
    – Kyle Kanos
    4 hours ago


















0












$begingroup$

The nucleosynthesis in the inner of the stars generates energy: The comes huge amounts of energy from generating Helium form hydrogen, the star gets a lot form generating carbon from helium and so an. This finishes with iron. To generate with larger atomic numbers the star needs energy. Most of them are generated in supernovae, where there is a giant excess of energy.






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New contributor




Uwe Pilz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






$endgroup$




















    0












    $begingroup$

    Iron is at the minimum point for energy release from fusion. For all atomic numbers less than that of iron, there is a net release of energy as additional protons and neutrons are added. Beyond iron, it's the reverse; energy must be input to fuse protons and neutrons into larger nuclei, which is why larger nuclei are only formed in supernova-type events and larger nuclei release energy on fission. As long as there are conditions to drive these processes, the tendency will be to build smaller nuclei up to iron and split larger nuclei down toward iron.






    share|cite|improve this answer









    $endgroup$












      Your Answer





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      4 Answers
      4






      active

      oldest

      votes








      4 Answers
      4






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      19












      $begingroup$

      The solar abundance of iron is a little bit more than a thousandth by mass. If we assume that all the baryonic mass in the disc of the Galaxy (a few $10^10$ solar masses) is polluted in the same way, then more than 10 million solar masses of iron must have been produced and distributed by stars.



      A type Ia supernova results in something like 0.5-1 solar masses of iron (via decaying Ni 56), thus requiring about 20-50 million type Ia supernovae to explain all the Galactic Fe.



      Given the age of the Galaxy of 10 billion years, this requires a type Ia supernova rate of one every 200-500 years.



      The rate of type Ia supernovae in our Galaxy is not observationally measured, though there have likely been several in the last 1000 years. The rate above seems entirely plausible and was probably higher in the past.






      share|cite|improve this answer









      $endgroup$








      • 1




        $begingroup$
        On an important side note: Iron has one of the largest nuclear binding energies (See en.wikipedia.org/wiki/…). So eventually, the percentage of iron in the universe will increase with time, as it is a stable end-product of both nuclear fusion and nuclear decay.
        $endgroup$
        – Robert Tausig
        10 hours ago










      • $begingroup$
        @RobertTausig doesn't iron have THE largest nuclear binding energy (rather than just "one of the largest")?
        $endgroup$
        – N. Steinle
        3 hours ago










      • $begingroup$
        Rob, I like your answer. Perhaps it could be even better if you include an approximate rate of double neutron star mergers (which of course the rate is very uncertain but we know that such mergers produce lots of heavy elements) ? Such a NS-NS rate is expected to be at least on the same order as that of supernovae.
        $endgroup$
        – N. Steinle
        3 hours ago






      • 2




        $begingroup$
        @N.Steinle The Q asks whether type Ia supernovae can be responsible for all the iron. Neutron star mergers do not produce iron. Iron does have "one of the largest" binding energies per nucleon. It is not the largest. That would be Ni 62.
        $endgroup$
        – Rob Jeffries
        2 hours ago
















      19












      $begingroup$

      The solar abundance of iron is a little bit more than a thousandth by mass. If we assume that all the baryonic mass in the disc of the Galaxy (a few $10^10$ solar masses) is polluted in the same way, then more than 10 million solar masses of iron must have been produced and distributed by stars.



      A type Ia supernova results in something like 0.5-1 solar masses of iron (via decaying Ni 56), thus requiring about 20-50 million type Ia supernovae to explain all the Galactic Fe.



      Given the age of the Galaxy of 10 billion years, this requires a type Ia supernova rate of one every 200-500 years.



      The rate of type Ia supernovae in our Galaxy is not observationally measured, though there have likely been several in the last 1000 years. The rate above seems entirely plausible and was probably higher in the past.






      share|cite|improve this answer









      $endgroup$








      • 1




        $begingroup$
        On an important side note: Iron has one of the largest nuclear binding energies (See en.wikipedia.org/wiki/…). So eventually, the percentage of iron in the universe will increase with time, as it is a stable end-product of both nuclear fusion and nuclear decay.
        $endgroup$
        – Robert Tausig
        10 hours ago










      • $begingroup$
        @RobertTausig doesn't iron have THE largest nuclear binding energy (rather than just "one of the largest")?
        $endgroup$
        – N. Steinle
        3 hours ago










      • $begingroup$
        Rob, I like your answer. Perhaps it could be even better if you include an approximate rate of double neutron star mergers (which of course the rate is very uncertain but we know that such mergers produce lots of heavy elements) ? Such a NS-NS rate is expected to be at least on the same order as that of supernovae.
        $endgroup$
        – N. Steinle
        3 hours ago






      • 2




        $begingroup$
        @N.Steinle The Q asks whether type Ia supernovae can be responsible for all the iron. Neutron star mergers do not produce iron. Iron does have "one of the largest" binding energies per nucleon. It is not the largest. That would be Ni 62.
        $endgroup$
        – Rob Jeffries
        2 hours ago














      19












      19








      19





      $begingroup$

      The solar abundance of iron is a little bit more than a thousandth by mass. If we assume that all the baryonic mass in the disc of the Galaxy (a few $10^10$ solar masses) is polluted in the same way, then more than 10 million solar masses of iron must have been produced and distributed by stars.



      A type Ia supernova results in something like 0.5-1 solar masses of iron (via decaying Ni 56), thus requiring about 20-50 million type Ia supernovae to explain all the Galactic Fe.



      Given the age of the Galaxy of 10 billion years, this requires a type Ia supernova rate of one every 200-500 years.



      The rate of type Ia supernovae in our Galaxy is not observationally measured, though there have likely been several in the last 1000 years. The rate above seems entirely plausible and was probably higher in the past.






      share|cite|improve this answer









      $endgroup$



      The solar abundance of iron is a little bit more than a thousandth by mass. If we assume that all the baryonic mass in the disc of the Galaxy (a few $10^10$ solar masses) is polluted in the same way, then more than 10 million solar masses of iron must have been produced and distributed by stars.



      A type Ia supernova results in something like 0.5-1 solar masses of iron (via decaying Ni 56), thus requiring about 20-50 million type Ia supernovae to explain all the Galactic Fe.



      Given the age of the Galaxy of 10 billion years, this requires a type Ia supernova rate of one every 200-500 years.



      The rate of type Ia supernovae in our Galaxy is not observationally measured, though there have likely been several in the last 1000 years. The rate above seems entirely plausible and was probably higher in the past.







      share|cite|improve this answer












      share|cite|improve this answer



      share|cite|improve this answer










      answered 17 hours ago









      Rob JeffriesRob Jeffries

      69.5k7139240




      69.5k7139240







      • 1




        $begingroup$
        On an important side note: Iron has one of the largest nuclear binding energies (See en.wikipedia.org/wiki/…). So eventually, the percentage of iron in the universe will increase with time, as it is a stable end-product of both nuclear fusion and nuclear decay.
        $endgroup$
        – Robert Tausig
        10 hours ago










      • $begingroup$
        @RobertTausig doesn't iron have THE largest nuclear binding energy (rather than just "one of the largest")?
        $endgroup$
        – N. Steinle
        3 hours ago










      • $begingroup$
        Rob, I like your answer. Perhaps it could be even better if you include an approximate rate of double neutron star mergers (which of course the rate is very uncertain but we know that such mergers produce lots of heavy elements) ? Such a NS-NS rate is expected to be at least on the same order as that of supernovae.
        $endgroup$
        – N. Steinle
        3 hours ago






      • 2




        $begingroup$
        @N.Steinle The Q asks whether type Ia supernovae can be responsible for all the iron. Neutron star mergers do not produce iron. Iron does have "one of the largest" binding energies per nucleon. It is not the largest. That would be Ni 62.
        $endgroup$
        – Rob Jeffries
        2 hours ago













      • 1




        $begingroup$
        On an important side note: Iron has one of the largest nuclear binding energies (See en.wikipedia.org/wiki/…). So eventually, the percentage of iron in the universe will increase with time, as it is a stable end-product of both nuclear fusion and nuclear decay.
        $endgroup$
        – Robert Tausig
        10 hours ago










      • $begingroup$
        @RobertTausig doesn't iron have THE largest nuclear binding energy (rather than just "one of the largest")?
        $endgroup$
        – N. Steinle
        3 hours ago










      • $begingroup$
        Rob, I like your answer. Perhaps it could be even better if you include an approximate rate of double neutron star mergers (which of course the rate is very uncertain but we know that such mergers produce lots of heavy elements) ? Such a NS-NS rate is expected to be at least on the same order as that of supernovae.
        $endgroup$
        – N. Steinle
        3 hours ago






      • 2




        $begingroup$
        @N.Steinle The Q asks whether type Ia supernovae can be responsible for all the iron. Neutron star mergers do not produce iron. Iron does have "one of the largest" binding energies per nucleon. It is not the largest. That would be Ni 62.
        $endgroup$
        – Rob Jeffries
        2 hours ago








      1




      1




      $begingroup$
      On an important side note: Iron has one of the largest nuclear binding energies (See en.wikipedia.org/wiki/…). So eventually, the percentage of iron in the universe will increase with time, as it is a stable end-product of both nuclear fusion and nuclear decay.
      $endgroup$
      – Robert Tausig
      10 hours ago




      $begingroup$
      On an important side note: Iron has one of the largest nuclear binding energies (See en.wikipedia.org/wiki/…). So eventually, the percentage of iron in the universe will increase with time, as it is a stable end-product of both nuclear fusion and nuclear decay.
      $endgroup$
      – Robert Tausig
      10 hours ago












      $begingroup$
      @RobertTausig doesn't iron have THE largest nuclear binding energy (rather than just "one of the largest")?
      $endgroup$
      – N. Steinle
      3 hours ago




      $begingroup$
      @RobertTausig doesn't iron have THE largest nuclear binding energy (rather than just "one of the largest")?
      $endgroup$
      – N. Steinle
      3 hours ago












      $begingroup$
      Rob, I like your answer. Perhaps it could be even better if you include an approximate rate of double neutron star mergers (which of course the rate is very uncertain but we know that such mergers produce lots of heavy elements) ? Such a NS-NS rate is expected to be at least on the same order as that of supernovae.
      $endgroup$
      – N. Steinle
      3 hours ago




      $begingroup$
      Rob, I like your answer. Perhaps it could be even better if you include an approximate rate of double neutron star mergers (which of course the rate is very uncertain but we know that such mergers produce lots of heavy elements) ? Such a NS-NS rate is expected to be at least on the same order as that of supernovae.
      $endgroup$
      – N. Steinle
      3 hours ago




      2




      2




      $begingroup$
      @N.Steinle The Q asks whether type Ia supernovae can be responsible for all the iron. Neutron star mergers do not produce iron. Iron does have "one of the largest" binding energies per nucleon. It is not the largest. That would be Ni 62.
      $endgroup$
      – Rob Jeffries
      2 hours ago





      $begingroup$
      @N.Steinle The Q asks whether type Ia supernovae can be responsible for all the iron. Neutron star mergers do not produce iron. Iron does have "one of the largest" binding energies per nucleon. It is not the largest. That would be Ni 62.
      $endgroup$
      – Rob Jeffries
      2 hours ago












      6












      $begingroup$

      Iron comes from exploding white dwarfs and exploding massive stars(Wikipedia).




      enter image description here
      Image source

      Periodic table showing the cosmogenic origin of each element. Elements from carbon up to sulfur may be made in small stars by the alpha process. Elements beyond iron are made in large stars with slow neutron capture (s-process), followed by expulsion to space in gas ejections (see planetary nebulae). Elements heavier than iron may be made in neutron star mergers or supernovae after the r-process, involving a dense burst of neutrons and rapid capture by the element.







      share|cite|improve this answer











      $endgroup$












      • $begingroup$
        While this may answer the question, it is preferable to have the content of the link copied into the post to avoid issues such s link rot, going off-site, etc.
        $endgroup$
        – Kyle Kanos
        4 hours ago















      6












      $begingroup$

      Iron comes from exploding white dwarfs and exploding massive stars(Wikipedia).




      enter image description here
      Image source

      Periodic table showing the cosmogenic origin of each element. Elements from carbon up to sulfur may be made in small stars by the alpha process. Elements beyond iron are made in large stars with slow neutron capture (s-process), followed by expulsion to space in gas ejections (see planetary nebulae). Elements heavier than iron may be made in neutron star mergers or supernovae after the r-process, involving a dense burst of neutrons and rapid capture by the element.







      share|cite|improve this answer











      $endgroup$












      • $begingroup$
        While this may answer the question, it is preferable to have the content of the link copied into the post to avoid issues such s link rot, going off-site, etc.
        $endgroup$
        – Kyle Kanos
        4 hours ago













      6












      6








      6





      $begingroup$

      Iron comes from exploding white dwarfs and exploding massive stars(Wikipedia).




      enter image description here
      Image source

      Periodic table showing the cosmogenic origin of each element. Elements from carbon up to sulfur may be made in small stars by the alpha process. Elements beyond iron are made in large stars with slow neutron capture (s-process), followed by expulsion to space in gas ejections (see planetary nebulae). Elements heavier than iron may be made in neutron star mergers or supernovae after the r-process, involving a dense burst of neutrons and rapid capture by the element.







      share|cite|improve this answer











      $endgroup$



      Iron comes from exploding white dwarfs and exploding massive stars(Wikipedia).




      enter image description here
      Image source

      Periodic table showing the cosmogenic origin of each element. Elements from carbon up to sulfur may be made in small stars by the alpha process. Elements beyond iron are made in large stars with slow neutron capture (s-process), followed by expulsion to space in gas ejections (see planetary nebulae). Elements heavier than iron may be made in neutron star mergers or supernovae after the r-process, involving a dense burst of neutrons and rapid capture by the element.








      share|cite|improve this answer














      share|cite|improve this answer



      share|cite|improve this answer








      edited 4 hours ago

























      answered 10 hours ago









      Keith McClaryKeith McClary

      1,239410




      1,239410











      • $begingroup$
        While this may answer the question, it is preferable to have the content of the link copied into the post to avoid issues such s link rot, going off-site, etc.
        $endgroup$
        – Kyle Kanos
        4 hours ago
















      • $begingroup$
        While this may answer the question, it is preferable to have the content of the link copied into the post to avoid issues such s link rot, going off-site, etc.
        $endgroup$
        – Kyle Kanos
        4 hours ago















      $begingroup$
      While this may answer the question, it is preferable to have the content of the link copied into the post to avoid issues such s link rot, going off-site, etc.
      $endgroup$
      – Kyle Kanos
      4 hours ago




      $begingroup$
      While this may answer the question, it is preferable to have the content of the link copied into the post to avoid issues such s link rot, going off-site, etc.
      $endgroup$
      – Kyle Kanos
      4 hours ago











      0












      $begingroup$

      The nucleosynthesis in the inner of the stars generates energy: The comes huge amounts of energy from generating Helium form hydrogen, the star gets a lot form generating carbon from helium and so an. This finishes with iron. To generate with larger atomic numbers the star needs energy. Most of them are generated in supernovae, where there is a giant excess of energy.






      share|cite|improve this answer








      New contributor




      Uwe Pilz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






      $endgroup$

















        0












        $begingroup$

        The nucleosynthesis in the inner of the stars generates energy: The comes huge amounts of energy from generating Helium form hydrogen, the star gets a lot form generating carbon from helium and so an. This finishes with iron. To generate with larger atomic numbers the star needs energy. Most of them are generated in supernovae, where there is a giant excess of energy.






        share|cite|improve this answer








        New contributor




        Uwe Pilz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
        Check out our Code of Conduct.






        $endgroup$















          0












          0








          0





          $begingroup$

          The nucleosynthesis in the inner of the stars generates energy: The comes huge amounts of energy from generating Helium form hydrogen, the star gets a lot form generating carbon from helium and so an. This finishes with iron. To generate with larger atomic numbers the star needs energy. Most of them are generated in supernovae, where there is a giant excess of energy.






          share|cite|improve this answer








          New contributor




          Uwe Pilz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.






          $endgroup$



          The nucleosynthesis in the inner of the stars generates energy: The comes huge amounts of energy from generating Helium form hydrogen, the star gets a lot form generating carbon from helium and so an. This finishes with iron. To generate with larger atomic numbers the star needs energy. Most of them are generated in supernovae, where there is a giant excess of energy.







          share|cite|improve this answer








          New contributor




          Uwe Pilz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.









          share|cite|improve this answer



          share|cite|improve this answer






          New contributor




          Uwe Pilz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.









          answered 19 hours ago









          Uwe PilzUwe Pilz

          875




          875




          New contributor




          Uwe Pilz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.





          New contributor





          Uwe Pilz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.






          Uwe Pilz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.





















              0












              $begingroup$

              Iron is at the minimum point for energy release from fusion. For all atomic numbers less than that of iron, there is a net release of energy as additional protons and neutrons are added. Beyond iron, it's the reverse; energy must be input to fuse protons and neutrons into larger nuclei, which is why larger nuclei are only formed in supernova-type events and larger nuclei release energy on fission. As long as there are conditions to drive these processes, the tendency will be to build smaller nuclei up to iron and split larger nuclei down toward iron.






              share|cite|improve this answer









              $endgroup$

















                0












                $begingroup$

                Iron is at the minimum point for energy release from fusion. For all atomic numbers less than that of iron, there is a net release of energy as additional protons and neutrons are added. Beyond iron, it's the reverse; energy must be input to fuse protons and neutrons into larger nuclei, which is why larger nuclei are only formed in supernova-type events and larger nuclei release energy on fission. As long as there are conditions to drive these processes, the tendency will be to build smaller nuclei up to iron and split larger nuclei down toward iron.






                share|cite|improve this answer









                $endgroup$















                  0












                  0








                  0





                  $begingroup$

                  Iron is at the minimum point for energy release from fusion. For all atomic numbers less than that of iron, there is a net release of energy as additional protons and neutrons are added. Beyond iron, it's the reverse; energy must be input to fuse protons and neutrons into larger nuclei, which is why larger nuclei are only formed in supernova-type events and larger nuclei release energy on fission. As long as there are conditions to drive these processes, the tendency will be to build smaller nuclei up to iron and split larger nuclei down toward iron.






                  share|cite|improve this answer









                  $endgroup$



                  Iron is at the minimum point for energy release from fusion. For all atomic numbers less than that of iron, there is a net release of energy as additional protons and neutrons are added. Beyond iron, it's the reverse; energy must be input to fuse protons and neutrons into larger nuclei, which is why larger nuclei are only formed in supernova-type events and larger nuclei release energy on fission. As long as there are conditions to drive these processes, the tendency will be to build smaller nuclei up to iron and split larger nuclei down toward iron.







                  share|cite|improve this answer












                  share|cite|improve this answer



                  share|cite|improve this answer










                  answered 1 hour ago









                  Anthony XAnthony X

                  2,78211220




                  2,78211220



























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