Re: OT: Dyson's Disaster

Anton Sherwood wrote:
> > Lars Henrik Mathiesen wrote:
> >> And once the sun moves off center I think the nearest part
> >> of the structure must flex towards it, which will cause a
> >> net force to make it move even more.
>
>Andreas Johansson wrote:
> > Actually, displacing the sun from the centre won't change anything
> > (except the depth of your tan!) for the same reason that it won't be
> > any force from the sphere on the sun. . . .
>
>But there is a force from the sun on each part of the sphere.  The
>forces are globally balanced, but the local mass doesn't know that. ;)
>
>If the sphere is infinitely rigid, of course, that's not a problem.
I may be wrong, but I think the sphere'll act as an arch, and therefore
won't need to be extremely strong to survive that effect.

Another problem: While the sphere won't be attracting anything inside it,
any bodies within it will attract eachother, wherefore air will be dropping
into the sun. Spinning the sphere won't help, since the air at the poles
would still fall into the sun, creating a low pressure that sucks in more
air und so weiter. Tip: Get a spacesuit and don't make a polar picnic.

                                                Andreas

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