Comment In this house we obey the laws of thermodynamics! (Score 1) 225
Dyson spheres would glow in the infrared and therefore be pretty obvious. This is because they still have to radiate the heat produced by the star they enclose - otherwise their internal temperature would perpetually increase.
Isn't that purely supposition?
No, it's pretty well tested. Just because you don't understand something does not mean that no one does. Compare to geometry: you might not know how to construct a given shape, but you can probably say something about its properties given a few conditions that it must satisfy.
For example, we know that relativity is an extremely accurate description of the geometry of spacetime. We have proved mathematically that energy must be conserved, in addition to observational evidence. That gives us the conditions that a Dyson Sphere must satisfy: it must exist in a universe with the same physics. However, even setting aside that requirement -- if your technology can break the laws of thermodynamics, why would you need a Dyson Sphere?
The next time you feel compelled to argue that your ignorance is as good as someone else's knowledge, may I suggest in lieu of posting here that you start a television or political career?