Even our lighting is converting over to LED, and that will reduce visible frequencies even more. Eventually an advanced solar system wide civilization would build a roof over the whole place and even their central star would disappear.
A sufficiently active dyson sphere might glow in infrared but we'd think of it as a likely failed star!
Our local galaxy cluster has BILLIONS of what seem to be failed stars.
“A sufficiently active dyson sphere might glow in infrared but we’d think of it as a likely failed star!”
I read a sci-fi book that postulated that the reason red dwarfs are so common is that some actually much larger stars inside of dyson spheres. I suppose it would help with all the missing mass they talk about.
Freegards
"I myself have dreamed up a structure intermediate between Dyson spheres and planets. Build a ring 93 million miles in radius - one Earth orbit - around the sun. If we have the mass of Jupiter to work with, and if we make it a thousand miles wide, we get a thickness of about a thousand feet for the base.
And it has advantages. The Ringworld will be much sturdier than a Dyson sphere. We can spin it on its axis for gravity. A rotation speed of 770 m/s will give us a gravity of one Earth normal. We wouldn't even need to roof it over. Place walls one thousand miles high at each edge, facing the sun. Very little air will leak over the edges.
Lord knows the thing is roomy enough. With three million times the surface area of the Earth, it will be some time before anyone complains of the crowding."
- - Larry Niven, "Ringworld"
All we've developed so far ar Dyson Vacuums.