Le 13/11/2012 07:04, Stephen a écrit :
> This is not a stable configuration. If there was a star in the centre of
> the torus. 

I do not expect a star at the center. Rather far far away.
(a star at the center gives us back to a Dyson sphere, or belt in such
case)

But remains the question of coincidence of planes for rotation &
revolution, and the impact on day-light on some part of the surface.


Any slight movement of the torus to the centre would be
> magnified by the closer part being attracted to the star more than the
> part that is further away. Starting a wobble that would end up looking
> like a hula hoop.

If the star has any significant difference of influence on the near &
far part of the torus, it will crumble the torus fast.

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