Seveneves

Seveneves by Neal Stephenson
867 Pages

" A catastrophic event renders the earth a ticking time bomb. In a feverish race against the inevitable, nations around the globe band together to devise an ambitious plan to ensure the survival of humanity far beyond our atmosphere, in outer space. But the complexities and unpredictability of human nature coupled with unforeseen challenges and dangers threaten the intrepid pioneers, until only a handful of survivors remains . . .; Five thousand years later, their progeny; seven distinct races now three billion strong; embark on yet another audacious journey into the unknown . . . to an alien world utterly transformed by cataclysm and time: Earth."

When the moon explodes humanity must find a way to survive into the future.  Two thirds of the book deals with this struggle over a period of 10 years.  Then suddenly it is 5,000 years later.  There is a lot of science in the book which can be daunting but Stephenson manages to make it interesting.  Good for fans of Sci-Fi.