I think most reasonable folks would agree that, given the size of the universe, there are probably non-Terran civilizations out there somewhere. As stated, though, the chance of communicating with them is next to 0, figuring that most communication is limited to the speed of light. Even the best interferometers being planned will be able to detect planets no further than, say, 1000 light-years away.
On the other hand, it is known that spin-paired particles seem to communicate at faster-than-light speeds when separated. It is possible that if you were to create two atoms absolutely identical to each other in every quantum detail that changes to one would be reflected in the other regardless of distance; this would allow for FTL communication.
re: humans being the oldest/most technologically advanced civilization.
Arledrian, when it comes to thinking about the universe then all possibilities must be considered, including that one. [img]graemlins/petard.gif[/img]
I agree with Ziroc--I'd love to be able to live long enough to see even the next 200 years.
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