Bah, spent all day yesterday spreading Managed Democracy, so missed this live but looking forward to this one as well! REALLY appreciate how you actually go through and show formulas too
I have to say, Jason ....you are quality !!.....your knowledge and absolutely zero ego combined with a professional narration deserves credit 👏 bravo Sir!.....kudos to you 🖖🖖
People still know what paperclips and paper is;the dream of a paperless office was as misguided as the dream of the internet uniting humanity. But a micro SSD card is about a paperclip's weight. I hate the 'antimatter is matter going back in time' quip. I have met a hundred people who believe it goes back in time from its creation in a very literal fashion. A common quip is that there's an antimatter antiuniverse moving back in time from the big bang which also explains the lack of antimatter. I thought the Nuclear Shell Model was a whole thing, where there *were* electron-like orbits in the nucleus.Is it just outdated like the Bohr model?
Good comments. I know the time-reverse is a bit clickbaity, but it’s one interpretation from Feynman diagrams. And you are of course correct about the nuclear shell model. This intro-level treatment for an Astro 101 class doesn’t provide the space for it yet. However, such a correction and update are in my list.
Bohr model is really a temporary bridge between orbits and orbitals, that only describes the coulomb part of the of the interaction, eg, no fine structure. Nuclear shell mode is totally legit, and the shells are similar to atomic shells. Similar bc: You’re putting spin 1/2 fermions in potential well with angular momentum..hence the 2x, and 2L + 1 for integer L numbers appearing. Different bc: Protons are identical fermions Neutrons are identical fermions Neutrons and protons are approximately identical nucleons in different states…see isospin. Nucleon nucleon interaction is strong, so you can’t ignore/ Fudge multi particle interaction….very different from electrons. NN potential is non central….weird. There’s also an NNN potential that cannot be written as a three body problem with two body interactions. Basically: it’s hella complicated, but shell is still good.
Thank you so much sir for your fascinating lectures, they're so informative and presented in such a great way, that it's easy to understand the presented concept.
This was mostly a great presentation. But I really wish people would stop comparing the Sun to hydrogen bombs. They are completely different fusion processes with different inputs. You couldn’t make solar core material explode if you tried, whereas hydrogen bombs run on isotopes specifically chosen to explode. That’s why the Sun doesn’t act like a bomb.
Interesting that theory and observation disagreeing meant new physics, and the new physics was just completely different from 19c stuff that produced the disagreement.
![Cody Johnson - I'm Gonna Love You (with Carrie Underwood) [Official Music Video]](http://i.ytimg.com/vi/yy9PuYMU29g/mqdefault.jpg)
Bah, spent all day yesterday spreading Managed Democracy, so missed this live but looking forward to this one as well!
REALLY appreciate how you actually go through and show formulas too
I have to say, Jason ....you are quality !!.....your knowledge and absolutely zero ego combined with a professional narration deserves credit 👏 bravo Sir!.....kudos to you 🖖🖖
Wow, thank you!
Radiations escapes the stellar interior by a random walk
Didn't think I would feel such a kinship with gamma radiation.
Burn things, drop things, and explode things. Science.
Great lesson, thanks. Please remember though that weak force bosons take energy to be created.
People still know what paperclips and paper is;the dream of a paperless office was as misguided as the dream of the internet uniting humanity. But a micro SSD card is about a paperclip's weight.
I hate the 'antimatter is matter going back in time' quip. I have met a hundred people who believe it goes back in time from its creation in a very literal fashion. A common quip is that there's an antimatter antiuniverse moving back in time from the big bang which also explains the lack of antimatter.
I thought the Nuclear Shell Model was a whole thing, where there *were* electron-like orbits in the nucleus.Is it just outdated like the Bohr model?
Good comments. I know the time-reverse is a bit clickbaity, but it’s one interpretation from Feynman diagrams. And you are of course correct about the nuclear shell model. This intro-level treatment for an Astro 101 class doesn’t provide the space for it yet. However, such a correction and update are in my list.
Bohr model is really a temporary bridge between orbits and orbitals, that only describes the coulomb part of the of the interaction, eg, no fine structure.
Nuclear shell mode is totally legit, and the shells are similar to atomic shells. Similar bc:
You’re putting spin 1/2 fermions in potential well with angular momentum..hence the 2x, and 2L + 1 for integer L numbers appearing.
Different bc:
Protons are identical fermions
Neutrons are identical fermions
Neutrons and protons are approximately identical nucleons in different states…see isospin.
Nucleon nucleon interaction is strong, so you can’t ignore/
Fudge multi particle interaction….very different from electrons.
NN potential is non central….weird.
There’s also an NNN potential that cannot be written as a three body problem with two body interactions.
Basically: it’s hella complicated, but shell is still good.
I'm from London England but the world over a filter cigarette weighs a gram for future reference FYI 😎with respect 🤘
It’s a good time when Jason drops a new lecture….
Thank you so much sir for your fascinating lectures, they're so informative and presented in such a great way, that it's easy to understand the presented concept.
This was mostly a great presentation. But I really wish people would stop comparing the Sun to hydrogen bombs. They are completely different fusion processes with different inputs. You couldn’t make solar core material explode if you tried, whereas hydrogen bombs run on isotopes specifically chosen to explode. That’s why the Sun doesn’t act like a bomb.
Interesting that theory and observation disagreeing meant new physics, and the new physics was just completely different from 19c stuff that produced the disagreement.
Typical modern US currency weighs 1 gram per bill. It does not matter which denomination you use either.
'a lot' seems curiously vague , when discussing neutrino radiation energy loss in the sun
Timestamp?
39:00 is there a region where you start the pp chain and then don’t have the temp to fuse the helium 3? I say no, since helium 3 is rare.
41:00 I appreciate the 🌞 🦎 relation vs a 🌡️ ☢️ 💣 . That’s the weak interaction vs the strong interaction.