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>He contends that there likely isn't a sentient civilization within about a billion light years of us because the signature of Dyson spheres would be unmistabka

>He contends that there likely isn't a sentient civilization within about a billion light years of us because the signature of Dyson spheres would be unmistabkable and unmissable. I guess the human civilization doesn't count as "sentient" because we don't have a Dyson sphere yet... Also how "unmissable" is a dyson sphere? Do we have the means to survey every single star within one billion light year radius? Hell, we know neutron stars are real, same for blackholes, but does that mean we observed every single one of them and didn't miss a single one?

sandworm101 8y ago
Dyson spoke of "swarms", not spheres. The sphere came earlier in scifi. The dyson swarm was a network of solar collectors orbiting a star, a far more practicable structure than the hollow sphere concept. We are babystepping towards this. We have probes out there blocking, harvesting, a tiny fraction of our star's energy already.