this post was submitted on 29 Jun 2023
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Cover author: Michał Kałużny http://astrofotografia.pl/

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[–] exscape@kbin.social 5 points 1 year ago* (last edited 1 year ago) (2 children)

My favorite fact from that article (indeed xkcd) isn't about neutrinos though, but this:

Which of the following would be brighter, in terms of the amount of energy delivered to your retina:

  1. A supernova, seen from as far away as the Sun is from the Earth, or
  2. The detonation of a hydrogen bomb pressed against your eyeball?

The answer is the supernova, by 9 orders of magnitude. So the supernova at the Sun's distance is about a billion times brighter than a hydrogen bomb pressed against your eyeball.

https://what-if.xkcd.com/73/

[–] Narrrz@kbin.social 1 points 1 year ago

Oh i had forgotten that! Thanks for reminding me!

[–] Xeelee@kbin.social 1 points 1 year ago (1 children)

So would that actually make a difference to the speed at which you're incinerated?

[–] exscape@kbin.social 1 points 1 year ago

The neutrinos? According to the article you'd probably be inside the star to be at the neutrino-lethal distance, so you'll clearly be dead before it even goes supernova. :-)

If it were still lethal at a distance you could survive, my slightly informed guess is that it could matter, as AFAIK supernovas tend to release the neutrinos before most of the light.
However I have no idea for how long the main part of the neutrino flood last or how long it'll take to kill you, could be anything from less than a second to minutes or hours, at which time you'd certainly be dead from the rest of the supernova.