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QUADRILLIONS AND QUADRILLIONS
Such a lifeform would be more of a pollenating intelligence than a "civilization" as we understand the term, so that wouldn't conflict with my suspicion that complex civilizations may all have life expectancies that are shorter than the time frames needed to cross interstellar distances. For all we know, there could be an advance wave of self-replicating machines just now reaching the outer fringes of our own Kuiper belt, drifting from one TNO to the next, due to arrive on Earth in another 10 or 20 thousand years.
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