‘Deep Thought’ -On the Weekend Poll Question: "Does a 1.5 GigaYear ET Civilization Exist?"
For a species to survive for a billion and a half years would have to be a tough job. They would have to get past challenges such as large-scale war with weapons of mass destruction, catastrophically climate-changing energy demands, asteroid strikes, neighborhood supernovas, and other dangers to spread throughout their galaxy and beyond.
Still, with as many stars, and by extension potentially habitable planets, as are in the known universe, let alone the universe beyond what we can see, I think it stands to reason that there's a civilization of sapient beings out there that's managed to survive those challenges. That civilization is almost certainly not in our galaxy, and may not be in our galactic cluster or even supercluster, but it's probably out there.
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