Originally Posted by FiReC

Think of the dinosaurs, those mother fuckers were never getting of this rock and they had a few hundred million years to get it right, and now they gone. Even if there were a bunch of 'dinosaur' planets everywhere, what do you think the chances are that the existence of two advanced civilizations would ever intersect in a 13 x 1000 million years timeline (human ancestors only around last 6 million years) ?

Our timeline of earth being 4.5 billion years old (and us being here) is our timeline, that means every other galaxy,solar system,star and planet has its own timeline with life development timelines different from each other in the scale of 100's of millions of years. Good luck matching up those timelines where the most advanced intersect each other to the same moment in time where they can actually meet.

It seems improbable that the timelines would ever match up, now add in the whole fucking distance between life in the universe, and you are basically at a chance of 0 for life forms as advanced as us to run into each other.