Surely a Dyson sphere would not emit what we naively expect. Look at us, we can speculate about these and even try to spot them but are millennia away from buil

Surely a Dyson sphere would not emit what we naively expect. Look at us, we can speculate about these and even try to spot them but are millennia away from building one. What if the external shield of the sphere would be artificially heated to 4000K or higher ? Completely invisible.