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