Probability Sun is the 2001 science fiction novel -2nd in a trilogy- by Nancy Kress. I thoroughly enjoyed the first one and liked this even better. A fun read, if a bit heavy on physics I can't begin to understand. I had trouble putting it down. You can read the prologue here.
For Charles Sheffield, founder, The Charitable Foundation for the Promotion of Scientific Literacy Among People Purporting to Be Science Fiction Writersfrom the back of the book:
Kirkus Reviews concludes, "Kress’s always-excellent characters wrestle with a splendid array of puzzles and problems, human, alien, and scientific: another resounding success for this talented, sure-footed writer." Publishers Weekly closes with this: "Readers will start this novel because of Kress's reputation, will read it for the adventure and will like it for the characters and the science."Salvation or Annihilation?
A strange artifact has been discovered on a distant planet, an artifact that may be the key to humanity's salvation. For we at war with the Fallers, an alien race bent on nothing short of genocide, and this is a war we are losing. The artifact is not only a powerful weapon, but possibly the rosetta stone to a lost superscience ... a superscience that the Fallers may have already decoded. Or it may be a doomsday machine that could destroy the very fabric of space.