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Ringworlds


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#1
CyberMisterBeauty

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Will we ever have ringworlds? How would we build them and what technologies would be necessary to create them?

 

 

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#2
starspawn0

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Your best bet is robots, together with a low-g source of raw materials (log-g, because you don't need as much fuel to move them) -- for example, from the moon.

You'd need advances in AI for that. Eventually, it will be possible to build a fleet of constructor-bots that can gather together the raw materials to make a ringworld; and then can combine them in just the right way to build the outer ring. Maybe a few centimeters of graphene, followed some other hard -- but not has hard as graphene -- and abundant material. After the supports are made, anther set of robots could work on building the buildings and other structures. Water and a biosphere could be added.

#3
kjaggard

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the mathmatics suggest no known material is strong enough to support a ring spinning enough to hold the air in an open topped ring. and the building of the side walls to keep the air in would also be an engineering miracle to achieve. And then there would be issues of a magnetic field that sheilds us from radiation and is generated by the earths core. 

 

http://larryniven.fa.../wiki/Ringworld


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#4
Maximum7

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Coincidentally.


https://www.trevorwr...es-1-ringworlds

#5
Alislaws

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A Bishop Ring is like a ringworld but not around a star and usually much much smaller, so those could be feasible.

 

Ringworlds would be too big for us to build with any known materials. If we figured out how, we'd still need more mass than exists in the solar system unless maybe it was very thin?


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#6
starspawn0

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I don't see why the material needs to be so strong.  Maybe I'm overlooking something obvious. 

 

You would need some amount of strength to protect against outside objects hitting the ring, and also to hold up buildings and air, and force of gravity from the sun in opposite direction (which helps you).  But distributed over the surface area, it's not too bad.  1 atm pressure for the air, and a suitable amount of it to achieve that pressure from centrifugal force, alone -- and no more.  

 

I think the main problem is going to come from finding suitable mass to convert to rotational energy.  But, again, I don't see it requiring as much as has been claimed.  I haven't run the numbers, though.  One can estimate all this easily using E = mc^2, along with (1/2)m (rw)^2 to compute the rotational kinetic energy.



#7
Squillimy

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Likely pico or fempto technologies. Manipulating matter on the atomic scale in order to create strange materials sufficient to make this not only feasible but safe. Think 'metals' that are 100x denser than steel but 100x lighter and perhaps just importantly, 100x as flexible.

 

Second is shielding technology (forcefields perhaps or something else). Not only in case of meteorites, but possibly for a magnetic field as well? Cause, you know, radiation.

 

Third is self replicating robotics. It's the only way that a project of this size could be completed in a reasonable amount of time. Self-replicating robots not only build the structure but are in charge of breaking down and finding material for the structure.

 

Lastly and most importantly is artificial super-intelligence. Not just regular AI. The amount of computing power to be able to coordinate not just these robots over an ENTIRE STAR SYSTEM. But also break down source material, communicate simultaneously with SEVERAL other robots what their needs are. What the building plans are. Make sure the project doesn't collapse. Take in to consideration light delay between trillions of individual neumann probes therefore using advanced algorithms to predict these needs themselves, and make automatic adjustments of the ringworld (for example, a slight problem or fluctuation could exponentially increase over time making it harder to correct)


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