Is dark matter just dark because of all the Dyson Spheres?

Dark matter doesn't interact with light at all (hence the name). read more

Dark matter doesn't interact with light at all (hence the name). But a better way to understand that is that dark matter doesn't interact with anything via the electromagnetic force (light can be thought of as being composed of an electric field and a magnetic field that together travel as a wave - at least, that's the model in classical physics). read more

One of the main reasons Dark Matter is a theory is because we do not see enough stars to explain all the mass in the galaxy. Dyson Spheres could explain this. The only way to distinguish a situation like this from “Dark Matter” would be if the encased star were to transit past another star which would be really hard to detect. read more

A Dyson sphere would completely enclose a star, but the idea that it could make use of all the energy radiated from the star goes completely against thermodynamics. Unless the sphere itself were made of dark matter, it would reach some equilibrium temperature in interacting with the star, and it would radiate with a black body spectrum characteristic of that temperature. read more