While Einstein's basic theories of relativity pretty conclusively prove that linear travel at speeds greater than the speed of light is impossible, his further theories about gravity wells and the fact that space is NOT linear when mass and gravity are introduced leave the question of interstellar travel far more open ended than at first glance. Steven Hawking said it best as he visited the set of Star Trek: The Next Generation and commented as he passed the engineering deck set, "I'm working on that."
The odds are slim that there isn't SOME other form of life out there. Possibly intelligent. But even so, and even assuming the plausibility of interstellar travel, there are more stars and solar systems than we could possibly ever explore, the odds of getting out there at all are slim, then the odds of picking the right star system out of the billions available are even slimmer.
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'He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me.'
-TJ
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