Or at least intelligent life that modifies its home system in a way that is visible from thousands of light years away.
I admit that a Dyson sphere seems like an arbitrary place to stop, but I think my basic argument stands either way. If any intelligent life was that common, some of it would spread.
Or at least intelligent life that modifies its home system in a way that is visible from thousands of light years away.
I admit that a Dyson sphere seems like an arbitrary place to stop, but I think my basic argument stands either way. If any intelligent life was that common, some of it would spread.