"A star’s light would fade as it was encased in such a “Dyson sphere,” but Dyson noted the constructions could be detected by the mid-infrared glow of their rad

"A star’s light would fade as it was encased in such a “Dyson sphere,” but Dyson noted the constructions could be detected by the mid-infrared glow of their radiated waste heat" -- In Star Control II [1] the player meets an alien race which admits to having tampered with humanity's DNA to "alter its smell" so that other, hostile civilisations can't "smell" us. Maybe there's someone looking out for us and hid us in a quiet corner :-) [1] https://en.wikipedia.org/wiki/Star_Control_II https://en.wikipedia.org/wiki/Star_Control_II