If the galactic halo was a bunch of Dyson spheres generating antimatter
for later, or disassembled stars, we'd score. Except for why they left
the rest of the galaxy alone. As a compact reservation? Fine, but
apparently every other galaxy would have the same structure. Seems odd,
without FTL.
I've wondered about the intergalatic bubbles: if you had a soup of
galaxies, and randomly seeded it with rare expanding intelligence, would
you get the bubbles we observe, with visible galaxies in the areas
between colonized volumes? I have trouble checking the idea against the
fact that we're seeing everything in the past, though, and against the
flux in the old background radiation.
-xx- GCU Mangyn of Chaos X-)
"For instance, suppose we apply this to nuclear weapon explosions over
inhabited cities. The Copernican principle says that we don't have a
privileged position within the interval of such usage - odds are, most
of them have already happened. And the odds that there are thousands
and thousands to come? Just astronomical. So don't worry, be happy -
no nuclear wars can ever happen, probably."
-- Tommy the Terrorist