linkedin post 2018-02-04 06:17:55

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CHEMICAL EVOLUTION OF GALAXIES. “Galactic chemical evolution (GCE), in particular, has provided stringent constraints on stellar yields. Different elements are produced from stars on different timescales. Therefore, elemental and isotopic abundance ratios evolve as a function of time in a galaxy.” https://lnkd.in/gg9biYa View in LinkedIn
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linkedin post 2018-02-04 06:16:11

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“THE CNO CYCLE refers to the Carbon-Nitrogen-Oxygen cycle, a process of stellar nucleosynthesis in which stars on the Main Sequence fuse hydrogen into helium via a six-stage sequence of reactions.” C12 —> N13 —> C13 —> N14 —> O15 —> N15 —> C12. “Thus, the carbon-12 nucleus used in the initial reaction is regenerated in the final one and hence acts as a catalyst for the whole cycle. Stars of lower mass convert hydrogen to helium via an alternative process known as the ‘proton-proton chain’.“ https://lnkd.in/gfyaz5f View in LinkedIn
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linkedin post 2018-02-04 06:09:48

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BUILDING ELEMENTS. “Then we build our way up through the periodic table creating heavier and heavier things through different types of processes. In some cases we just add a proton and it grows. In other cases we add a bunch of neutrons and these neutrons decide to flip what they are between protons decaying through a process called the reverse beta decay.” http://www.astronomycast.com/transcripts/AstroCast-080922_transcript.pdf View in LinkedIn
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linkedin post 2018-02-04 06:07:26

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“NEUTRONS in the core. You end up with things like helium-4 which is a helium atom which is number 2 on the periodic table. That 4 means that it has four bits, two protons and two neutrons sitting in its nucleus. Helium-4 is like one of the most stable things that you get.” http://www.astronomycast.com/transcripts/AstroCast-080922_transcript.pdf View in LinkedIn
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linkedin post 2018-02-04 06:04:53

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ABC OF ALL MATTER. “It all comes down to proton and neutron number at the end of the day. The number of protons tells you what type of element it is. So, you have hydrogen with one proton; helium with two protons and you build your way up through the periodic table adding more and more protons.” https://lnkd.in/efDcCRq View in LinkedIn
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linkedin post 2018-02-04 06:03:14

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STEPPING STONES. “Okay so one proton is hydrogen. Two protons is helium. Three protons is lithium, etc. So, that’s where you go up with the numbers. Whenever you see gold or lead, the first number is the number of protons and if you add another proton, you have a new element, right?” http://www.astronomycast.com/transcripts/AstroCast-080922_transcript.pdf View in LinkedIn
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