The Origin of Homo Optimus:Humans, Aliens and Superbrains
by William D. Gibson
Multiple story lines, including the development of a human-friendly superintelligence; the apocalyptic earth-crossing course of a dark comet; and the strange happenings of the pre-colonization expedition to Jupiter's moon, Europa all come together in the final chapter which answers all.
Would you believe the author has the same first & last names as a more famous sci-fi writer? It's true.