EVERYTHING about that is out for debate. Whether they do or do not is still unsure. The Universe in itself is full of mysteries. NO ONE really knows what is in every corned of it. It's fun to speculate and I personally, believe it is highly probable of the fact that "someone" else is out there. To think, that we're the only "Big Game" in the universe TO ME? Is pretty boastful. haha But that's just me.