>>986
More than that, there's no material existent today or even on the horizon which could possibly be strong enough.
Dyson was well aware of that according to wikipedia:
> In response to letters prompted by his original paper, Dyson replied, "A solid shell or ring surrounding a star is mechanically impossible. The form of 'biosphere' which I envisaged consists of a loose collection or swarm of objects traveling on independent orbits around the star."
Which is entirely possible, if we design von Neumann machines which will both multiply and build the swarm, without going all Skynet on us...