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A comment on The Fermi Paradox and the Aurora Effect: Exo-Civilization Settlement. Parent comment

Re:The Fermi Paradox and the Aurora Effect: Exo-Civilization... by neuronic on Monday September 23, 2019 @07:47AM (#21047952)
It's not dark matter because it blocks light. It's dark matter because its only observable interaction is by gravity.

So aside from being perfect in terms of energy capture so that the underlying stars emit absolutely no EM at any frequency, the proposed Dyson spheres would also need to be completely transparent to any background EM such as visible light picked up by sensors like Hubble.

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Re:The Fermi Paradox and the Aurora Effect: Exo-Civilization... by m4rtink on Monday September 23, 2019 @07:58AM (#21048009)
Good point - if we are able to detect gas clouds, we would be likely able to detect such swarms as well simply by all the blocked light.
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