Breathing is something the fandom is still discussing, since there hadn't been cases of yukkuris dying because of lack of oxygen. So i wouldn't take it for granted, specially when there are some other pics of YUKKURIS IN SPAAAAAACE.
And what you call "Crack" i can see it as random electrical power emanations, you know, for drama and all that stuff, typical in anime to add some electrical lighting thingy to make the energy blasts more "dramatic".
Anyway, we are discussing magical talking manjuus to begin with, so no much room for serious realismn, specially if you consider that a yukkuri in space would only float around and as much change the direction they may be spinning while floating, because, well, they lack propulsion of any type, and i doubt braids would give enough propulsion to move around ,at least enough to "Body Slam" something.
JIE, waving braids around wouldn't propel a yukkuri because they would probably bring the braid back to its previous position, thus counteracting any movement with an opposite and equal reaction. The way that yukkuri propel themselves through space is by expelling feces. Their feces are super massive and make up a significant part of their weight.
As for the oxygen, I basically use whatever piece suits my perceived canon. like this one post #2447
Waving braids may generate enough movement, but not for foward propulsion or anything, but to, you know, spin around and stuff, if i recall correctly limbs do influence your direction, though not your movement in space.
And i doubt shitting would be a good method of propulsion for yukkuris, since, they lack the ability to, well, "divide" or "adminstrate" their poop, they take whole dumps, complete lumps, so while it may give propulsion to some degree, you wouldn't be able to chance course or stop for a while until you are able to poop again, and no, you can't just go on pooping, it may kill the yukkuri to poop too much.
Besides we would still need to see if pooping do generate enough propulsion, for all we know, the size may not matter and if you dump out something, it may barely move you because it lacks the power to propulse you like a jet fire or something.
The only way i may see it work even in yukkuri standars, aside of the "Selective and Administrative" way of pooing, they would need to have the weird case of, instead of taking whole dumps, to fire a stream, which while some yukkuris do it, it's darn rare or a sign of something wrong is going on in the body.
Anyway, Yukkuris in Space are pointless, rather blast and vaporize the fuckers, and you would be doing them a favor, after all, nobody can listen you whine and take it uneasy in space.
There's no evidence that yukkuri can't divide their poo poos into smaller chunks. We've never seen them do it, but we've never really seen them try.
Besides which, I assumed we were talking about space yukkuri (yukkuri who have lived in space their entire lives and feed off of asteroids and shit). Otherwise there's no way that a yukkuri could be supported by any planet or break free of its planet's gravitational well.
And the reason that space yukkuri can propel themselves by shitting is that their stuffing is super dense and their initial launch has them shoot out something like 99.99% of their mass at a fairly high speed (let's say 5 m/s) so they end up going about 50,000 m/s (not factoring in relativity), almost twice times as fast as the Earth travels around the Sun.
The .01% of its mass that it retains is the skin and a bit of super dense filling that it uses to change direction (it can regain mass by eating asteroids and shit).
And how would you propose killing a planet-sized ball of dough hurtling at you slightly slower than the fastest man-made object?
Well the evidence is the lack of any material saying otherwise, but again this is fandom, until someone makes it, it won't happen, they didn't shit or piss at the beginning until someone made it happen, so until then, no poo poo dividing.
And i doubt a yukkuri living in space would eat asteroids and stuff, in fact, it would be the worse scenario for a yukkuri, they love food and stuff, asteroids aren't food, at least not for a non rock and dirt eating race like the lil buggers we are discussing.
And the thing is, regardless of the poo's size, there is also the yukkuri's size and the power which the poo is propelled, which usually isn't much so it either doesn't propell at all or plainly does a weak impule that makes it move foward slooooooooooowly.
You need some serious force for propulsion, not only mass, specially to move a big object in space, if not, a human could propel faster by only flingling a chip in space, and we know that a human to move fast needs at least to throw away a bucket or something averagely heavy, aside of throwing it with a notorious force, not simply "push it away".
The force that Pooing generates is too weak like to make a fast movement, in theory it may have some possibilities of starting moving, but if we are talking about average turds,there would barely be mass and force to push. And since in space, if i recall correctly, you don't necessarily increase speed as you move on unless external factors like gravity or finding ways to increase the impulse, then you will go on and on and on with the same slow ass speed.
Anyway...
Gotta love how we are going all pseudo science babble about magical manjuus and their turds in SPACE.
Yukkuri can crap and then we later see the same yukkuri vomiting up its bean paste almost immediately afterwards. Maybe space yukkuri can steer by vomiting their remaining filling, not actually expelling it anally.
And considering the immense power that dosuyukkuri can put out as well as the constant nuclear radiation put out by utsuho yukkuri, I see no reason to assume that planet-sized yukkuri couldn't put out similar amounts of energy while poopooing. If you can't buy that then just pretend that it uses master spark to propel itself.
And yes, a human can propel faster by flinging a chip in space. It's usually a tiny amount because chips are tiny and the chip isn't thrown with enough force to compensate for it's relative tininess, but it does have an effect.
What i mean by faster is by really going faster, usually you need a strong force to go fast in space, if not, you'll impulse, yeah, but you'll go slow, until something hits you stopping you, gives you a stronger impulse or something, so no, you won't go faster by flinging a chip alone, specially if you are static and want to start moving.
And just because Dosu Spark and Utsukurri's nuclear blast are powerful that won't mean shitting will be powerful, you really need some sort of jet stream like shitting to get some serious speed, if not, it will be a slow and maybe ever spinning impulse. Size =/= more power for propulsion in space, force is the key for more power for propulsion, size only matters when it needs to be proporsional to the object that it will impulse, again a bucket sized object for a human to go fast but the bucket object also needs to be thrown hard if you want a strong impulse, it's mass alone won't do anything by just doing a soft push.
So yeah, shitting won't do anything, and vomiting would be as efective as flailing the braids, since it doesn't "shot out" it comes out barely and probably won't do anything but make it spin in one of it's axis.
Dosu Spark MAY be a better option for propulsion but well, it also costs them, if they don't want to die by using it, they need mushrooms if not 3 and they are dead....which actually reminds me that yukkuris would die anyway since vomiting and shitting take out bean paste, and at some point it would start taking out the VITAL bean paste, reason why i mentioned the whole "dividing poop" part, since at the end, he would kill itself if it shits more than just stale paste.
Anyway it doesn't matter, clearly this Yukkuri is dead and Earth is saved, just look at it, energy blast hitting it in the face, 1/3 of it already vaporized, i mean, no braid, no remainig of the hat, nothing.
So it doesn't matter, Mister Easy Orbital Planetary Cannon is vaporizing it easy.
Hmm actually it may be a magic spell now that i'm checking it closer, the "ring" looks a bit like one of those "Magical Chanting Rings" thingies, maybe is an Orbital Master Spark chanted by someone of the most powerful peeps in gensokyo.
Force and mass are directly related. And I was assuming that Marisa started out in space since she's a space yukkuri. Without strong gravity or air resistance or anything, she can basically use a single, fast blast.
That's nice, but talking/sentient/whatever pieces of food really aren't scientifically feasible and thus, probably don't follow the laws of physics. I like the planetary cannon idea better, anyway.
On a more constructive note, I'm sure this is a duplicate image.
It still was a fun discussion, though i'll be honest, unless is some far future on which mankind had started to reach the stars, and the yukkuris became on it's majority nice heads, leading to humanity "letting" the yukkuris to tag on space adventures.
I think the little buggers won't be leaving earth at all, hell in the worse case they may be exctinct when humans had already reached the stars with ease, instead of this simple "poking" we had been doing since we reached the moon.
