Last Day on Mars (Chronicle of the Dark Star, Bk. 1)

It is Earth year 2213 - but, of course, there is no Earth anymore, not since it was burned to a cinder by the sun. The human race has fled to Mars to prepare for a centuries-long trip to our new home across the galaxy, and Liam Saunders-Chang and his friend Phoebe will be on the last starliner to depart before Mars, like Earth, is destroyed. But before they leave, Liam and Phoebe will make a series of profound discoveries - about time, space, and a dangerous struggle for survival in our universe.