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Originally posted by esteay812
Icould imagine that if an alien race had a ship that couldn't travel that fast , but was large enough to sustain life for an extended period of time, then it could be possible for them to return. But where were they going when they left, and if it would supposedly take them 1,500yrs. to get there, I would think that by the time they arrived significant advances would have been made in space travel and would allow them to return much, much quicker. But hypothetically speaking, and looking at where I think you are going with this, It is possible that they left, in a slow moving space-craft, and plan to return here in 2012.