actually the reason i say that...is because if you think logically it is hard to imagineeven aliens living longer than a 1000 yrs. And if the laws of physics are true then you cant travel faster than light which leaves us witht he possibility of a limited number of star systems which have planets capable of supporting life as we know. Even if there is a system within a 1000 light yrs that can sustain life...there is no telling how advanced life would have gotten. I believe bacterial life thrives in the galaxy but I would doubt that intelligent life would be able to reach us for a long time...