Aurora by Kim Stanley Robinson
Summary: An ark story of a journey to a nearby star, told by an interesting narrator. Like all good hard science fiction, proposes a variant on one of the solutions to the Fermi paradox. Lots of exploration of the social and biological challenges of survival on a journey to the stars. The later especially noteworthy as often overlooked in hard science fiction.
Rating: The plot, such as it is, is not particularly gripping. But the ideas and thoughts put in to the hard science part of the novel make this one worth the read.