I cant think of an instance of this in science fiction, but then I do not have the broadest knowledge of the field, so I could have missed something obvious to everyone else. I wonder, though, could a planet form at the center of mass of a binary star system or be captured there, and could this planet be habitable if everything was positioned just right? There would be no night of course and the two stars would appear to orbit around the planet. Could this planet have a moon? My knowledge of physics is not very deep, either, so I am not really sure of what other issues being at that position would cause.