Re: (TFT) Space travel - galaxy sized dyson spheres.

[Denis DesHarnais <denisdesharnais@gmail.com>]

To return to serious(ish)ness, who ever built a dyson sphere better have a
pretty awesome AC unit.  I would imagine that the contents would hotten-up
considerably once the plasma ejected from the sun wasn't being vented into
interstellar space.  Granted, at one AU, there's alot of space to fill, but
the sun also ejects a fair amount of stuff per year, and the stuff it
ejects is rather warm.

On Wed, Dec 7, 2011 at 10:17 AM, Mark Tapley <mtapley@swri.edu> wrote:

> At 8:43 -0500 12/7/11, Jim wrote:
>
>> Recent readings from the Voyager craft seem to indicate that the solar
>> wind varies quite a bit and spins with the sun.  That could make the
>> stresses on an enclosed sphere rather extreme.
>>
>
>        Voyager as well as others; and it varies from equator to pole of
> the sun as well, even over a long-term average.
>
>        However, if the sphere is anything like strong enough to hold
> itself up, it probably could withstand all of those variations as well.
>
>        However, I think the same "Shell Theorem" that effectively cancels
> gravity inside the sphere *also* cancels the effect of the solar wind on
> the sphere for centering purposes. That is, for any given direction, a
> closer segment of sphere sees a denser solar wind, but a farther away
> segment sees a greater area of solar wind. Equivalently stated, there's
> just as much solar wind coming out to the left as there is to the right
> (long-term average), so the sphere won't be pushed either way.
>
>        So I have to vote with PvK; the "blue ghost" (sic?) of "Ringworld
> Engineers" would be a necessity.
> --
>                                                - Mark     210-379-4635
> ------------------------------**------------------------------**
> -----------
> Large Asteroids headed toward planets
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