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?
$begingroup$
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?
astrophysics astronomy
$endgroup$
add a comment |
$begingroup$
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?
astrophysics astronomy
$endgroup$
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
add a comment |
$begingroup$
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?
astrophysics astronomy
$endgroup$
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
astrophysics astronomy
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
add a comment |
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
add a comment |
4 Answers
4
active
oldest
votes
$begingroup$
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.
$endgroup$
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
add a comment |
$begingroup$
Iron comes from exploding white dwarfs and exploding massive stars(Wikipedia).
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.
$endgroup$
$begingroup$
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
add a comment |
$begingroup$
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.
New contributor
$endgroup$
add a comment |
$begingroup$
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.
$endgroup$
add a comment |
Your Answer
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4 Answers
4
active
oldest
votes
4 Answers
4
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
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.
$endgroup$
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
add a comment |
$begingroup$
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.
$endgroup$
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
add a comment |
$begingroup$
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.
$endgroup$
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.
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
add a comment |
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
add a comment |
$begingroup$
Iron comes from exploding white dwarfs and exploding massive stars(Wikipedia).
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.
$endgroup$
$begingroup$
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
add a comment |
$begingroup$
Iron comes from exploding white dwarfs and exploding massive stars(Wikipedia).
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.
$endgroup$
$begingroup$
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
add a comment |
$begingroup$
Iron comes from exploding white dwarfs and exploding massive stars(Wikipedia).
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.
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Iron comes from exploding white dwarfs and exploding massive stars(Wikipedia).
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.
edited 4 hours ago
answered 10 hours ago
Keith McClaryKeith McClary
1,239410
1,239410
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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.
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– Kyle Kanos
4 hours ago
add a comment |
$begingroup$
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
add a comment |
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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.
New contributor
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add a comment |
$begingroup$
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.
New contributor
$endgroup$
add a comment |
$begingroup$
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.
New contributor
$endgroup$
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.
New contributor
New contributor
answered 19 hours ago
Uwe PilzUwe Pilz
875
875
New contributor
New contributor
add a comment |
add a comment |
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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.
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add a comment |
$begingroup$
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.
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add a comment |
$begingroup$
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.
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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.
answered 1 hour ago
Anthony XAnthony X
2,78211220
2,78211220
add a comment |
add a comment |
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7
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Therefore no iron is released. are you sure?
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– Kyle Kanos
23 hours ago
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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?
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– Rick
23 hours ago
2
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This table in Wikipedia's "Nucleosynthesis" article might help, detailed here.
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– Nat
23 hours ago
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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.
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– UKMonkey
7 hours ago
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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/…
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– Rick
2 hours ago