But that never gets brought up.
/johnny
Until there’s evidence of life beyond this blue orb it’s just as “correct” to say that we’re it, as it is to assume that we’re not. Seems highly unlikely in light of the apparent scale of the universe, but until it’s known it’s conjecture.
http://www.amazon.com/Bowl-Heaven-Gregory-Benford/dp/0765366460
Bowl Of Heaven does a nice job of depicting advanced life in a universe constrained by known physical laws. It and it’s sequel were a couple of my best recent Sci-Fi reads...