what if ring world in space

If ring world in space 

The earth may not be our home forever , Eventually we may have to leave . What if instead of finding a potentially habitable exoplanet light years away we stayed in our solar system and built a habitat so enormous we could never overpopulate if this is what if and here is what would happen if we built a ring world in space imagine you lived on ring with a radius of 150 million km encircling the sun a gigantic artificial world with its own gravity ecosystem and atmosphere big enough for trillion of humans to call home you had live on an enormous landmass on the inner side of the ring the outer shell would protect you and all those trillions of people from the hazards of outer space.

problem is assembling such a thing suspended out in the solar system wouldn't be easy you couldn't just pull the earth apart and have an army of robots reassemble it into a ring world among the many problems you had run into your first world be finding the material , the ISS roaming the earth's lower orbit right now weight about 420 tons . Something like a ring world would tip the scales at no less than a million tons where would we find all this material there is a place the Kuiper belt beyond the orbit of Neptune would do just fine. This ring of icy bodies stretches out for alomost 3 billion km some Astronomer think the Kuiper belt world have enough material for this project but it's hard to tell exactly how much we had need to construct a thing like this we might have to sacrifice all the planets moons and asteroids in the solar system our ring world and the sun would be the only things lefr if we could manage to gather and transport all the materials available then construction would being it would take lot of Physical labour an army of robots and maybe hundreds of generation to realise that our structure was not stable enough because the megastructure would turn out so enormous it woul break any known molecular bonds we have to find a way to make use of one of the fundamental forces of nature the strong nuclear force of all forces it's the grippiest it bonds material on the scale of atomic nuclear so that nothing can break it apart or maybe we'd come up with a new super strong material altogether

but until we figure that out every inter stellar body passing through our solar system would be a threat to our megastructure the next thing we have to worry about is gravity that part is pretty easy we just have to spin the ring world at nearly 2,000,000 km/h . That's really fast we have to build up the speed over time luckily maintaining in the frictionless environment of space wouldn't be too hard such rotation wold generate centrifugal force and that in turn would creat an artificial gravity equal to the one we have here on earth with gravity solved we have to bring in the atmosphere and starts population the ring world for the inhabitants of the megastructure it would always be daytime unless we could create a day and night cycle which extra panels inside the ring but for all the epicness of the world we just created it wouldn't be stable a single asteroids strikes could cause the structure to drift closer to the sun a hole punched through the ring could let all out atmosphere out and massive solar Strom don't even get me started on that one failure inside the ring could doom the entire structure together with its inhabitants it's just too risky to build it around the sun.....