The Oceans Between Stars (Chronicle of the Dark Star, Bk. 2)

It is earth year 2223, but the Earth, along with the entire solar system, is gone. Liam and Phoebe, having barely escaped our exploding sun with their lives, are in stasis for the decade-long journey to the rogue planet Delphi, where they hope to meet up with the rest of the human refugees.

Phoebe, however, is carrying a dark secret. One that finds her waking up at various points in their journey, changing their path through space. One that will decide the fate of the human race and many others besides. One that, very soon, she must reveal to Liam, whether he's ready for the truth or not.