APOD: Where Your Elements Came From (2017 Oct 24)

Comments and questions about the APOD on the main view screen.
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Fred the Cat
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Re: APOD: Where Your Elements Came From (2017 Oct 24)

Postby Fred the Cat » Sun Oct 29, 2017 5:20 pm

Magnesium bioavailability is limited. That’s why Milk of Magnesia or magnesium citrate is helpful in a certain condition of the bowel. :wink:
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jajohnson51

Re: APOD: Where Your Elements Came From (2017 Oct 24)

Postby jajohnson51 » Sun Oct 29, 2017 9:53 pm

BDanielMayfield wrote:
Thank you so much for clearing this up for us. Of course, each answer often leads to further questions. Can you point us to papers and/or articles that give more details re this dying low-mass star heavy element production pathway?

Bruce


This is technically known as the slow neutron-capture or "s"-process. A place to get started is the wikipedia page for the s-process.

Jennifer

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Re: APOD: Where Your Elements Came From (2017 Oct 24)

Postby BDanielMayfield » Mon Oct 30, 2017 12:07 am

jajohnson51 wrote:
BDanielMayfield wrote:
Thank you so much for clearing this up for us. Of course, each answer often leads to further questions. Can you point us to papers and/or articles that give more details re this dying low-mass star heavy element production pathway?

Bruce


This is technically known as the slow neutron-capture or "s"-process. A place to get started is the wikipedia page for the s-process.

Jennifer


Thanks sincerely Jennifer.
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StarRolf
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Re: APOD: Where Your Elements Came From (2017 Oct 24)

Postby StarRolf » Tue Oct 31, 2017 5:24 pm

geckzilla wrote:
StarRolf wrote:This is a great chart, but unfortunately frustrating for a colorblind person like myself. 'Big Bang fusion' and 'Merging neutron stars' are very difficult to distinguish, at least on my monitor, as are 'Dying low-mass stars' and 'Exploding massive stars.' I have this same problem with other charts I see online. It would be nice if a better way of displaying data could be found, or at least better color or texture combinations.

Here, try this one. It's definitely not perfect, but it should be at least a little easier to read. It could certainly use a redo. The Cosmic Ray Fusion boxes look nearly identical to the ones that are kind of gray colored and not even included in the key. It would be impossible for you to realize that Tc, Fr, Ra, Po, At, Rn, Pm, Ac, Pa, and Np in fact have no label at all.

Thanks! This looks a lot better!

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Re: APOD: Where Your Elements Came From (2017 Oct 24)

Postby StarRolf » Tue Oct 31, 2017 5:27 pm

Chris Peterson wrote:
StarRolf wrote:This is a great chart, but unfortunately frustrating for a colorblind person like myself. 'Big Bang fusion' and 'Merging neutron stars' are very difficult to distinguish, at least on my monitor, as are 'Dying low-mass stars' and 'Exploding massive stars.' I have this same problem with other charts I see online. It would be nice if a better way of displaying data could be found, or at least better color or texture combinations.

Color is a fundamental way of displaying data, and works well for most people. It is probably not realistic to expect most graphical data presentations to accommodate color blindness. There are, however, numerous browser plugins which will dynamically reassign colors based on your color blindness type. I'd suggest installing one of those, which will probably make your browsing much easier.

Thanks for the suggestion! I am trying Fresh Eyes for Chrome. I can toggle it on and off and have different filtering options. This could be a very handy tool for me going forward!

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geckzilla
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Re: APOD: Where Your Elements Came From (2017 Oct 24)

Postby geckzilla » Tue Oct 31, 2017 10:58 pm

StarRolf wrote:
geckzilla wrote:
StarRolf wrote:This is a great chart, but unfortunately frustrating for a colorblind person like myself. 'Big Bang fusion' and 'Merging neutron stars' are very difficult to distinguish, at least on my monitor, as are 'Dying low-mass stars' and 'Exploding massive stars.' I have this same problem with other charts I see online. It would be nice if a better way of displaying data could be found, or at least better color or texture combinations.

Here, try this one. It's definitely not perfect, but it should be at least a little easier to read. It could certainly use a redo. The Cosmic Ray Fusion boxes look nearly identical to the ones that are kind of gray colored and not even included in the key. It would be impossible for you to realize that Tc, Fr, Ra, Po, At, Rn, Pm, Ac, Pa, and Np in fact have no label at all.

Thanks! This looks a lot better!

Just FYI, I posted a textured one later after that post: https://upload.wikimedia.org/wikipedia/ ... xtured.svg

(linked to the one I put on Wikipedia since it is a more updated version)
Just call me "geck" because "zilla" is like a last name.

Santa6

Re: APOD: Where Your Elements Came From (2017 Oct 24)

Postby Santa6 » Wed Nov 08, 2017 1:49 pm

Whenwill scientists announce that the universe is much older than initially thought? Surely information contained in this table means that several cycles of explosion and forming dust clouds and new stars and exploding again had to take place just to make all the elements found on earth. So the big bang can not be the beginning but an event in a long chain of events that happened over hudereds (or thousands) of billons of years, not so?

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Re: APOD: Where Your Elements Came From (2017 Oct 24)

Postby Chris Peterson » Wed Nov 08, 2017 1:58 pm

Santa6 wrote:Whenwill scientists announce that the universe is much older than initially thought? Surely information contained in this table means that several cycles of explosion and forming dust clouds and new stars and exploding again had to take place just to make all the elements found on earth. So the big bang can not be the beginning but an event in a long chain of events that happened over hudereds (or thousands) of billons of years, not so?

Several cycles of star formation and destruction have occurred to create all the elements. All of them after the Big Bang.
Chris

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BDanielMayfield
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Re: APOD: Where Your Elements Came From (2017 Oct 24)

Postby BDanielMayfield » Wed Nov 08, 2017 4:13 pm

Chris Peterson wrote:
Santa6 wrote:Whenwill scientists announce that the universe is much older than initially thought? Surely information contained in this table means that several cycles of explosion and forming dust clouds and new stars and exploding again had to take place just to make all the elements found on earth. So the big bang can not be the beginning but an event in a long chain of events that happened over hudereds (or thousands) of billons of years, not so?

Several cycles of star formation and destruction have occurred to create all the elements. All of them after the Big Bang.

That's right. The more massive a star is, the shorter its lifespan, so several generations of massive stars can come and go even in a billion years. More than 13 billion years of star formation is an immense span, plenty of time to have produced everything we observe.

Bruce
"Happy are the peaceable ... "


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