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This is quite simply put, a fleet of satellite
some kind of sensible orbit that rotate quickly
cover a 360 deg band of space, preferably roughly in
direction that doomsday asteroids are most likely to
from given everybody's rotation around the galaxy
lively jaunt around the sun. Balancing this rotational
will of course be the minimum time needed to gaze
distant objects to collect enough light to perceive
Maybe we cover more of the sky this way and have
chance of protection from oumuamua's larger and
friendly relatives, little green men, bored Borg
adventure, or even more hostile alien politicians of