Thoughts about sphere worlds

[primitive]

And for those really adventourus mathemathicans:
Try to calculate the actual strength the sphere material need to have to stop it from collapsing at the poles (earth orbit, spinning so it has 1 G at equator), using all available building materials in the solar system (except the sun) for the construction.

You would have to discard the Atom and find another way to connect Quarks to get a material strong enough.