There's something poetic about humanity's attempt to detect other civilizations somewhere in the Milky Way's expanse. There's also something futile about it. But we're not going to stop. There's little doubt about that.
One group of scientists thinks that we may already have detected technosignatures from a technological civilization's Dyson spheres, but the detection is hidden in our vast troves of astronomical data.
A Dyson sphere is a hypothetical engineering project that only highly advanced civilizations could build. In this sense, 'advanced' means the kind of almost unimaginable technological prowess that would allow a civilization to build a structure around an entire star.
These Dyson spheres would allow a civilization to harness all of a star's energy. A civilization could only build something so massive and complex if they had reached Level II in the Kardashev Scale.
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