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/sci/ - Science & Math

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10456882 No.10456882 [Reply] [Original]

If you took a dyson sphere and put mirrors on the inside of it - assuming the mirrors were 100% reflective and indestructible, what would happen to the sun?

Would it destroy itself or get more powerful? Balloon into a supergiant?

>> No.10456888

your question is inherently flawed

it's like asking "if the laws of the universe didn't exist, could X happen?"

>> No.10456935

>>10456888
100% perfect mirrors have been created in labs

>> No.10456943

>>10456888
>w a s t e d
faggot, these kinds of assumption are always made in physics
>assume no friction, assume perfect insulation etc

>> No.10456949

>>10456882
There are people who tell you, that you hallucinate while on drugs...

Like how the fucks are drugs not allowed and thinking of dyson spheres is, while the prior is actually more productive?

>> No.10456956

>>10456949
Thought experiments aren't likely to make you eat someone's face off.

>> No.10456963

>>10456882
This seems like a very stupid question but as I was writing to rebuke you, it was seen to be reasonable, nay, even good. However, I cannot answer it, nor speculate with any assurances so I will withhold further comment until I have cogitated on this for the next day at least. I hope others will continue to reply as this thought-egg is being incubated. When it hatches, I shall post.

>> No.10456973

>>10456956
Have you ever seen something like that in real life? Like outside of TV life you live in, what is the probability I will eat somebody face, if I get proper dose of known substance?

It's waste of time, that's what it is, it's wasting your potential on hypothetical stuff that would be judged as pure delusion if you came up with it on drugs, so please get real and solve some problems.

People on drugs, "hallucinating" often come with more tangible things than a dyson sphere.

You're delusional and you're hallucinating autist living in his own world.

>> No.10456979

>>10456973
Up your dose junkie and off yourself. If you're sober right now then I feel bad for you.

>> No.10456980

>>10456882
bump for interest

>> No.10456982

the star will eventually collapse into a black hole

>> No.10456986

holy fuck this board is retarded. you guys make fun of /pol/ but they and /biz/ are at least 40 IQ points ahead of you idiots. I never see you guys bump threads which actually ask good questions, always retard bait instead.

>> No.10457002

>>10456986
Baited

>> No.10457029

>>10456882
Photon pressure is a thing, and an "empty" mirrored box weighs less than one full of photons.
You're going to create a kugelblitz.

>> No.10457047

>>10457029
>weighs
I guess you mean mass, but that obviously stays the exact same. And more photons getting reflected also means a higher surface temperature, making the outer layer expand.

>> No.10457048

>>10456882
Yes it will progressively ramp up the fusion rate causing the sun to expand until it absorbs your Dyson sphere or goes supernova and turns into a black hole.

>> No.10457134

>>10456986
we come here to shitpost, not actually talk seriously

>> No.10457143

>>10457134
>we
Fuck off.

>> No.10457338

>>10456882
Well, a 100% reflective mirror would receive effectively double the energy from each photon due to the principles of collisions, so I would guess it would tear itself apart.

>> No.10457350

>>10457338
>and indestructible
10/10 reading comprehension.

>> No.10457361

The reason you didn't get any serious answers is because the OP question looks like a troll question. however I'm going to attempt to give you a serious answer.

>> No.10457416

Ok so first off Entropy is still a thing which means the sphere will still give off infrared radiation.

If the sphere of mirrors was far away enough from the sun then the dissipation of infrared could be enough to cancel out any other heating effects and nothing would happen.

But we're going to assume the sphere is really fucking close to the surface of the sun and made of magical materials that can't break.

What would happen is that the temperature inside the sphere would slowly crank up. The added heat and sheer amount of photons would add pressure onto the star causing more and more fusion reactions of hydrogen atoms into helium atoms to occur. This will change the star type and cause it to release even more light from red to blue the more it heats up which causes it to heat up even more.

Eventually the pressure would be so high that only neutrons would be left and normally this would mean it would blast the rest of the star into the universe with a nova explosion. However due to the indestructible mirror sphere this doesn't happen. Instead it still gets shot off but just forms a layer of matter around the mirrors, blocking the reflection.

What happens now is that the pressure inside is still extremely high probably high enough that the matter sticking to the mirrors will itself undergo nuclear fusion and thus you'll get a sort of 2 layers. The white neutron star in the middle and a "normal star" layer that is against the middle with only massive amount of radiation between these 2. This would balance out the pressure as the 2nd sun layer against the mirrors would put pressure against the neutron core while the neutron core puts pressure against the sun layer on the mirrors and it'll stay like this until one of them runs out which would most likely be the 2nd sun layer after which you'll just have a normal neutron star. After this point science doesn't know what would happen.

(1/2)

>> No.10457420
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10457420

>>10457416
(1/2)

If quark stars are possible (there are hypotheses out there supported by math but we have never confirmed it). Then the neutron star would shed another layer and now you'd have a quark core and a neutron 2nd layer against the mirror. These would equalize each other in pressure after which the quark core would be the first to run out and the neutrons would stay against the mirror due to the pressure of its own radiation. After the pressure gets high enough again the same thing would happen only in the opposite order. Now the quarks would stay against the mirrors and the neutrons would be shot into the center again where they would clump. After this the cycle would continue for unknown amounts of times until all the matter has been transfered to energy after which it'll slowly dissipate outside of the sphere through infrared radiation.

If we assume the sphere broke entropy and didn't emit infrared radation then what would remain were extremely high power gamma rays doing all kinds of weird self-interaction that we have no current knowledge of.

Pic-related is how the layers would look like.

>> No.10457430

>>10456882
If the mirrors are both 100% reflective AND indestructible, then the interior of your sphere is cut off from the rest of the Universe and it does not matter what happens in there.

>> No.10458673

>>10456973
He's right. What are we doing here. There's trap threads on /b/ that need shitposting in

>> No.10458983
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10458983

>>10457420

>> No.10458989

>>10457430
Boring. Next!

>> No.10459026

>>10457430

plot twist: the whole structure is 100% transparent from the outside only.

>> No.10459259

>>10456882
what if we've thrown sun made out of ice into regural sun made out of lava?
would they extinguish each other, pass trough or make one big sun at room temperature???

>> No.10459549

>>10456882
In space, heat is only transferred by radiation. So by reflecting back all the photons you would start heating up the sun, causing the nuclear fusion rate to increase and thus swelling up the sun until it either swallows your dyson sphere or the energy lost by other energetic particles balances the increase in fusion.

>> No.10459632

OP here.

I asked my two physics friends at Uni and they said that due to the increase in pressure the sun would slowly increase in radiation burning meaning it would grow larger and larger which would envelop the dyson mirror and then because it worked its way up the radiation levels (?) it would then either explode or revert to equilibrium - they weren't too sure.

>> No.10459642

>>10459632
This is correct, only the mirrors are indestructible so it would explode within the sphere. As some anon detailed >>10457416 >>10457420

>> No.10459716

>>10456935
you're retard

>> No.10459742

>>10456963
Typed like a true shriveled arsehole

>>10457048
This is the correct answer

>> No.10459752

>assume an impossible scenario
Okay so I will imagine a world in which OP isn't a colossal fag

>> No.10459851

>>10459026
So 0% reflective from the inside, allowing 100% transparency when viewed from outside?

Then it does nothing.

>> No.10460013
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10460013

>>10456882
>100% reflective and indestructible
does being reflective mean all of the things emitted from the sun (particles, radiation, etc) are affected?
isn't it essentially getting cut off from the rest of the universe since nothing can get in or out? if it becomes a closed system, the distribution of matter and energy inside that space will eventually reach equilibrium. since it's isolated from the outside, from the perspective inside the sphere all matter and energy is in "ground state". if there's no change, "time" inside the sphere stops, right?

>> No.10460146

>>10459752
Dyson spheres are completely theoretical, but so it gravity. I suppose you think Newton was a colossal fag too?

Your lack of imagination is telling of your intelligence.
>>10460013
No

>> No.10460300

>>10460146
>Gravity is theoretical

>> No.10460320

>>10459026
>How does sight work