Our Book Club returns to read two recent, highly praised science fiction novels. From Kim Stanley Robinson comes \u201cAurora,\u201d the story of a spaceship sent from Earth to a far-off star in a trip that will take generations. And from Ian McDonald comes \u201cLuna: New Moon,\u201d a sort of \u201cDallas\u201d (or is it \u201cThe Godfather\u201d?) set on and under the surface of the moon. Plus, what else are we reading?