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

[Jay Carlisle <maou.tsaou@gmail.com>]

Wikipedia has this;

"There are several serious theoretical difficulties with the solid
shell variant of the Dyson sphere:
Such a shell would have no net gravitational interaction with its
englobed sun (see Shell theorem), and could drift in relation to the
central star. If such movements went uncorrected, they could
eventually result in a collision between the sphere and the starbmost
likely with disastrous results. Such structures would need either some
form of propulsion to counteract any drift, or some way to repel the
surface of the sphere away from the star.[8]
For the same reason, such a shell would have no net gravitational
interaction with anything else inside it. The contents of any
biosphere placed on the inner surface of a Dyson shell would not be
attracted to the sphere's surface and would simply fall into the star.
It has been proposed that a biosphere could be contained between two
concentric spheres, placed on the interior of a rotating sphere (in
which case, the force of artificial "gravity" is perpendicular to the
axis of rotation, causing all matter placed on the interior of the
sphere to pool around the equator, effectively rendering the sphere a
Niven ring for purposes of habitation, but still fully effective as a
radiant-energy collector) or placed on the outside of the sphere where
it would be held in place by the star's gravity.[16][17] In such
cases, some form of illumination would have to be devised, or the
sphere made at least partly transparent, as the star's light would
otherwise be completely hidden.[18]"

I'm not sure there's enough Si in a galaxy to shell itself, much less
leave anything inside, super massive black holes or no.
Of course that's just first blush... I've not put much sweat into the
subject yet.
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