Am Di, 27. Dez 2022, um 15:11, schrieb Jason Resch: > > > On Tue, Dec 27, 2022, 6:47 AM John Clark <[email protected]> wrote: >> On Tue, Dec 27, 2022 at 5:59 AM Jason Resch <[email protected]> wrote: >> >>> *> There's an interesting relationship between the strength of the >>> electrostatic repulsion between two protons, and the gravitational >>> attraction of protons. It works out such that it takes ~10^54 protons >>> gathered together in one place before the gravitational attraction can >>> overwhelm the electrostatic repulsion. In other words, stars as as big and >>> long-lived as they are because gravity is so weak.* >> >> That's true, and one of the biggest mysteries in physics is why gravity is >> so weak, after all the strong nuclear force can keep 100 or even 2 protons >> in one place. The only explanation I've heard is the hypothesis that there >> are other spatial dimensions besides the 3 that we're familiar with, string >> theory claims there are at least 9, but that all the forces of nature EXCEPT >> for gravity are confined to just 3 dimensions so they generally follow the >> law that says they decrease with distance according to the well known 1/r^2 >> rule, but gravity is free to radiate into all 9 dimensions so it decreases >> with distance according to a 1/r^8 rule; and the reason we don't see gravity >> behave this way in our everyday life is it the other 6 dimensions are curled >> up very tightly so the effect becomes apparent only at the ultra microscopic >> scale. It's a nice theory but there's not a scrap of experimental evidence >> to support it. > > > That's interesting I hadn't heard that detailed of an explanation before. > > There are also anthropic arguments for very weak gravity: > > If gravity were 10 times stronger than it is, stars like our sun would live > for 1 billion years, not 10 billion. > > Yey it took multiple billions of years to evolve multicellular life.
Interesting stuff Jason and John. I tend to go with anthropic explanations by default (because I cannot think of anything else). So much of our physical laws seem so precisely fine tuned for life that I struggle to come up with any other explanation. I seem to remember that Brent has a different view on this? Telmo > Jason > > >> >> John K Clark See what's on my new list at Extropolis >> <https://groups.google.com/g/extropolis> >> hfl >> >>> >> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Everything List" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/everything-list/CAJPayv2jR%2BUcPiSviVfghHmpzN7NN_yNURGiBKNcQvjYaD7y7g%40mail.gmail.com >> >> <https://groups.google.com/d/msgid/everything-list/CAJPayv2jR%2BUcPiSviVfghHmpzN7NN_yNURGiBKNcQvjYaD7y7g%40mail.gmail.com?utm_medium=email&utm_source=footer>. > > > -- > You received this message because you are subscribed to the Google Groups > "Everything List" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/everything-list/CA%2BBCJUgoesGmGwmOY6p6K%3DKsFirXR%3Da6AOYsYzy%2BzZJ70aSc%2BA%40mail.gmail.com > > <https://groups.google.com/d/msgid/everything-list/CA%2BBCJUgoesGmGwmOY6p6K%3DKsFirXR%3Da6AOYsYzy%2BzZJ70aSc%2BA%40mail.gmail.com?utm_medium=email&utm_source=footer>. -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/bcb5b562-74bc-420b-97d5-105d9a5d6077%40app.fastmail.com.
