I've asked myself this question many, many times and I would like to think that we are not. What I mean by this (if you haven't worked it out already) is are there other inhabited worlds out there? If so, are they as advanced as us, more advanced or less so?Who are they, where are they and will we ever know for sure in our lifetime?I'm fascinated by this, I really want to know the answer.I wonder if we ever will?