The last couple Battlestar Galactica episodes have really moved the story along. From the murder of Cally to the emergence of Baltar as a cult leader to the Cylon civil war, the writing has been solid and there are, at this point, so many mysteries but minor and major that it is easy to forget the big mystery:
Where is Earth?
I think we forget this mystery because, well, we all know where it is. Right beneath our feet. It is difficult to see why this is the primary mystery for many of the characters in the story, since it doesn't require any faith for us to believe that Earth exists.
More over at Athens Exchange