3 ms·

Probably here: https://what-if.xkcd.com/73/ https://what-if.xkcd.com/73/ And it’s even more astonishing — the supernova at 1 AU would be the same as a billion

Probably here: https://what-if.xkcd.com/73/ https://what-if.xkcd.com/73/ And it’s even more astonishing — the supernova at 1 AU would be the same as a billion hydrogen bombs at your eyeball.

mytailorisrich 1y ago
Another way to look at it is that a hydrogen bomb is very small at planetary scale and so microscopically small at any astronomical scale.
- aaronharnly 1y ago
  I appreciate this point – it would take quite a few Tsar Bombas to approach the binding energy of a planet.
bravesoul2 1y ago
But you are safe at a parsec. Showing how also incredibly big space is. Space's bigness makes it hard to blow up a galaxy. Big bang excepted.
- mr_toad 1y ago
  For certain values of safe. It’s close enough to strip the ozone layer, significantly increase the risk of cancer, alter the climate, and possibly cause extinctions.
- thechao 1y ago
  All the stars in the universe, burning as brightly as they are, are the tiniest fraction of additional energy compared to the 2.73°K background temperature of space. The Big Bang was very warm.
- ordu 1y ago
  It depends on the kind of supernova. Type Ia[1] is really insane. 10^44 J is a thing, that I think can blind you, even you've chosen a spot for your picnic to watch a Big Boom at distance of 1 parsec. A white dwarf made mostly of carbon burns all the carbon into oxygen in matter of seconds, and then it burns some of oxygen that was a result of burning carbon. It would like to continue brewing more and more heavy elements, but can't, because it becomes so hot, that gravity is no longer enough to keep the matter from flying away. [1] https://en.wikipedia.org/wiki/Type_Ia_supernova https://en.wikipedia.org/wiki/Type_Ia_supernova
- ithkuil 1y ago
  Space is big and quadratic function grows fast
  - bravesoul2 1y ago
    Yes the same reasons your jet wash can't water your entire garden at once.

Probably here: https://what-if.xkcd.com/73/ https://what-if.xkcd.com/73/ And it’s even more astonishing — the supernova at 1 AU would be the same as a billion hydrogen bombs at your eyeball.

mytailorisrich 1y ago

Another way to look at it is that a hydrogen bomb is very small at planetary scale and so microscopically small at any astronomical scale.

aaronharnly 1y ago
I appreciate this point – it would take quite a few Tsar Bombas to approach the binding energy of a planet.

bravesoul2 1y ago

But you are safe at a parsec. Showing how also incredibly big space is. Space's bigness makes it hard to blow up a galaxy. Big bang excepted.

mr_toad 1y ago
For certain values of safe. It’s close enough to strip the ozone layer, significantly increase the risk of cancer, alter the climate, and possibly cause extinctions.
thechao 1y ago
All the stars in the universe, burning as brightly as they are, are the tiniest fraction of additional energy compared to the 2.73°K background temperature of space. The Big Bang was very warm.
ordu 1y ago
It depends on the kind of supernova. Type Ia[1] is really insane. 10^44 J is a thing, that I think can blind you, even you've chosen a spot for your picnic to watch a Big Boom at distance of 1 parsec. A white dwarf made mostly of carbon burns all the carbon into oxygen in matter of seconds, and then it burns some of oxygen that was a result of burning carbon. It would like to continue brewing more and more heavy elements, but can't, because it becomes so hot, that gravity is no longer enough to keep the matter from flying away. [1] https://en.wikipedia.org/wiki/Type_Ia_supernova https://en.wikipedia.org/wiki/Type_Ia_supernova
ithkuil 1y ago
Space is big and quadratic function grows fast
- bravesoul2 1y ago
  Yes the same reasons your jet wash can't water your entire garden at once.