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30 & BoS & Which of the following terms best describes a fusion reaction? & \textbf{[04:51.639--06:05.83]} ...most basic type of fusion that exhibit ours the hydrogen gets fused into deuterium deuterium of trouble spelling which is another way of calling heavy hydrogen this is still hydrogen because it has one proton and one Neutron now it is not helium yet it does not have two it does not have two protons but then the deuterium keeps fusing and then we eventually end up with and then we end up with helium and we can even see that on the periodic table I lost my periodic table well I'll show you in the next video but we know hydrogen hydrogen hydrogen in its atomic state has an atomic number of one and it also has a mass of one it only has one nucleon and it's nucleus but it's being fused it goes to hydrogen too which is deuterium which is one Neutron one proton in its nucleus two nucleons and then that eventually gets fused and I'm not going to the detail of the reaction into helium and by definition helium has two protons and two neutrons so it has or we're talking about helium four in particular that isotope of helium it has an atomic mass of four and the whole this process releases a ton of energy because the atomic mass of the helium...\newline\textbf{[06:50.68--07:52.81]} ...there's there's questions of well what if what if there just wasn't enough mass to get to this level over here and there actually are things that never get to that quite that threshold to fuse all the way into helium there are a few things that don't quite make the threshold of stars that only fuse to this level so they are generating some of their eat or there are even smaller objects that just get to the point there's a huge temperature and pressure but fusion is not actually occurring inside of the core and something like Jupiter would be an example and you can go several several masses above Jupiter where you get something like that so you have to reach a certain threshold or the mass where the pressure and the temperature due to the heavy mass gets so large that you start this fusion at but the smaller you have above that threshold this the slower the fusion will occur but if you're supermassive the fusion will occur really really fast so that's a general idea of just how stars get formed and why they don't collapse on themselves and why they are these kind of little balls of fusion reactions existing in the universe and the next few videos we'll talk about what happens once that hydrogen fuel and the cure in the core starts to run out... \\\hline
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\caption{\textbf{Lecture-specific questions and lecture excerpts.} We used the
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text embeddings of each question about \textit{Four Fundamental Forces} (FFF)
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and \textit{Birth of Stars} to identify corresponding matching intervals of the
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text embeddings for each question about \textit{Four Fundamental Forces} (FFF)
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and \textit{Birth of Stars} (BoS) to identify corresponding matching intervals of the
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lectures. The text of the questions and the best-matching time intervals of the
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lecture transcripts are displayed (lecture times are noted in square brackets).
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Time courses of topic correlations for each question may be found in
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Supplemntary Figures~\ref{fig:forces-peaks} and~\ref{fig:bos-peaks}. Note that
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Supplementary Figures~\ref{fig:forces-peaks} and~\ref{fig:bos-peaks}. Note that
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no matching lecture interval was found for Question 29.}
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