
Centuries after the last humans left Earth, the Exodus Fleet is a living relic, a place many are from but few outsiders have seen. Humanity has finally been accepted into the galactic community, but while this has opened doors for many, those who have not yet left for alien cities fear that their carefully cultivated way of life is under threat.
- The Long Way to a Small, Angry Planet
- A Closed and Common Orbit
- Record of a Spaceborn Few
(Her more recent "To Be Taught, If Fortunate" is unrelated to the series but also a great read.)
EDIT: Formatting.
It goes into detail how on a generation ship the bodies are composted and become nutrients to grew new food upon.