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Originally Posted by gualbert
An idea about why there's no other advanced civilization in the universe:
if there were some, it's reasonable to assume that many of them have highly superior technology, including super fast space travel.
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If the speed of light is the upper limit of speed for anything to travel at, as it seem to be, it doesn't really matter how technologically advanced the civilization is. They can build fancy machines but breaking the laws of the physics is a whole another matter. It's very possible that the shortest route to the next object in space is a straight line, and there's no way around it. And even the speed of light is quite slow, if you compare it to the cosmic distances.
If that's the case and the nearest advanced civilization is, say, 10 000 light years away (which would be quite near in cosmological terms) we'd have no reasonable way of communicating with them or even finding them out, as we'd only see in each other's past.