Seveneves by Neal Stephenson

In this science fiction epic, humanity faces an existential crisis when the moon suddenly explodes, triggering a catastrophic chain of environmental disasters on Earth. With only two years before the planet becomes uninhabitable, nations unite to launch a daring plan to preserve human life by sending a select group of survivors into orbit. The narrative spans thousands of years, chronicling the efforts of these initial survivors to maintain the human race in space, the political and social challenges they face, and the eventual attempt by their far-future descendants to return to a drastically changed Earth. The story is a sweeping examination of human resilience, ingenuity, and the enduring quest for survival against insurmountable odds. The 7420th greatest book of all time