Yes, but one good aimed moderately sized asteroid could put a quick end to it. For a long-term preservation of humanity, it would be probably beneficial to colonise other celestial bodies. More baskets for eggs.
Discussion
I'm not convinced that will happen or that it has happened. Cataclysm? Yes. Unconvinced it is an external thing
You mean we float through the vast nothingness and the gigantic fission reactor that gives us literally all the power is infinitely stable? It just seems not very likely to meβ¦
No. I don't think any of that statement is correct. π
But the cataclysms are purely internal things with no external inputs whatsoever?
i'm pretty sure it needs to be an antimatter reactor
i'm sure it will need maintenance but part of its output will run its magnetic containment cell where the reaction takes place
once you nullify gravity, you don't have a speed limit problem, and collisions are impossible because they require mass and that is nullified.
of course i have no idea how you build such a thing but unlike fission or fusion, antimatter really does yield the e=mc^2 amount of energy out of any matter.