I find it frankly mesmerising that we can see so far into our universe, in an almost infinite distance, yet cannot say we have proof of not being alone in this world.
I guess that is because no one can travel these vast distances, and as nothing can travel faster than light, I guess it is just one of those dreams which would never come to pass.
The question of whether or not we're alone in the universe is by far for me the most mouth watering. Sadly humans are only in the metaphorical stone age of space travel yet.
@ Archean
To quote Star Trek: The Final Frontier
The people of your planet once believed their world was once flat. Columbus proved it was round.
They said the sound barrier could never be broken. It was broken.