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They can see stars. There wouldn't be stars in a type 2 civilization. There would be amorphous blackbody spectra which we do not see.
by maaku 11y ago
They can see stars. There wouldn't be stars in a type 2 civilization. There would be amorphous blackbody spectra which we do not see.
- rybosome 11y agoThat assumes that civilizations derive power by encasing their host star in a Dyson sphere, which is not a foregone conclusion; that prediction was based on our current understanding if technology. Think of Huygens who imagined that Venusians sailed the seas on ships held together with hempen rope.
- vectorjohn 11y agoAn "amorphous blackbody" source, from anything reasonably distant, just looks like a smaller star. There are a bunch of if's and unknowns involved, but it could be maybe possible to detect a Dyson sphere. This[1] article talks about it. The upshot is that it is nowhere near blindingly obvious, and we don't currently have the ability to differentiate between a natural or artificial infrared source. https://en.wikipedia.org/wiki/Dyson_sphere#Search_for_extra-terrestrial_intelligence https://en.wikipedia.org/wiki/Dyson_sphere#Search_for_extra-...