OK, I admit is a bit old of a theme, but I would like to discuss it - the extraterrestrials (furthermore is unavoidable after the Mars piece).
As always, the first question is are we alone? We, of course, don't know, so I can only offer you my humble opinion.
I believe, as probably most people, we are not the only reasonable life form in this vast (maybe endless) cosmos of ours. And why we haven't made a contact? Here comes the crazy part. We know that the universes are in a constant move, heading the same direction with unknown end point. I think that we will meet with the reasonable ETs when we get near to wherever we are headed.
Well, it seems only logical. What I never understood is why everyone assume that the ETs are more advanced than we are. If the Big Bang Theory is right and all the universes have been created at the same time, this means that, logically, it should have taken about the same time for life to develop in other planets. So, probably, the societies that came out of this process should have come to about same level.
That is if they are not a lot smarter than we are. And the time goes by the same way in their planet.
But if we take for granted that the reality is probably similar to ours in order to conceive life, then we should be at about the same "age". And the exciting moment of the meeting is to come.