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Oxygen in nebulae

Doshii Jun

Perpetual player
Retired Staff
Thomas has come up with an interesting point.

If you're unfamiliar with the issue at hand, the Sakura wants to be able to enter the Great Southern Nebula and fire its aether shock cannon at Mishhu forces.

To do this, an enterprising engineer (Miles Gunn by DocTomoe) has come up with a device to clear the gas of the nebula away. Not all of it of course; just enough to fire the cannon without frying everyone inside.

What Thomas has said (and from what I learned in astronomy, he's right) is that even an unordinary nebula is in no way dense enough to begin with to worry about all this gas burning up into RED HOT FIRE.

But even if the nebula were dense enough ... nebula carry next to zero oxygen, if not zero entirely. Even if we were to assume that the Great Southern Nebula was along the lines of a planetary nebula -- which at 10 light-years wide seems unlikely -- there still isn't enough oxygen to ignite anything. Hydrogen, which there's plenty of, also wouldn't flare up because it has no oxygen to help it along.

There's also the issue of what an aether beam does. Thomas takes it as such --


  • Aether beam touches something.
  • Aether beam annihlates it outright.

If we were talking about a scalar pulse, that's one thing. Perhaps it could ignite some of the heaviest elements in a nebula. But that's comparable to trying to ignite a metal bottlecap using a glowing ember of wood from thirty feet away -- the density simply isn't there, and the elements are difficult to ignite anyway.

I'm no scientist. So if anyone wants to lance the work, feel free. And I know I'm bringing real-world physics into a fantasy setting. But something tells me that Lor's helpful cloud shield isn't very helpful at all, and it doesn't take a strange device to make it safe to fire a weapon inside. Besides which, Lor must exist in a hole in the nebula -- surely it revolves around a star somehow, which would've used up the gas and dust of the area to form itself.

After all, as Thomas said in his opening argument, if aether could light a nebula on fire, how could nebulae create stars?
 
I don't know where the whole "burning nebula" idea came from. My concern has always been that firing some sort of large scale weapon could create a ripple effect that would push nebula gasses into the path planet Lor. If there was enough force or gasses, it could be dangerous.
 
I think it came from how the rest of us interpreted the need for a weapon to handle the nebula ... but just pushing gases? What weapon would both push and compact enough gas to really harm the planet? Legacy Cannon wouldn't, I'd think ... there don't seem to be any massive aether beams that would do it anymore. *shrugs*
 
I really don't think that would happen. Nebulas are not dense, and with most of the weapons there isn't much of a displacement effect. They annihilate the matter, not shoving it to either side.

(spelling fixed by Wes)
 
I think it depends on what the nebula is made of. If there is anything that could be oxygenating, or maybe it's made up of substances that when heated would turn into an oxidizer? This is why bullets can fire in space. They have an oxidizer in them which removes the need for oxygen. Salt Peter is an oxidizer.
 
To the best of my knowledge, nebula are so thin (as in density) that even if you had one made of oxygen and propane you probably couldn't start a fire because the molecules would still be like 3 feet away from each other.
 
A related concept is the habitable gas torus. It doesn't work for about the same reasons, but if it did, you could have an asteroid belt where plants could grow on every rock, and people could use them to farm, live in straw huts, and presumably travel from 'roid to 'roid using... sailboats. I'm not sure anyone worked out how the meteorology or climatology of such a place would function.

It's a really cool idea, but far better-suited for a fantasy setting. Ringworlds are more plausible, and just about as fantastic. I suppose sufficiently advanced technology could make things work either way, though.
 
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