Xeelee Sequence
A SERIES OF NOVELS AND SHORT STORIES BY SCIENCE FICTION AUTHOR STEPHEN BAXTER
Xeelee; Xeelee Cycle; Xeelee technology; Qax (species); Xeelee Sequence species; Squeem; Bolder's Ring; Xeelee nightfighter; Photino bird; Photino birds; Xeelee sequence species; Xeelee sequence; Spline (alien beings); Xeelee Technology; Starfall (novel); Xeelee: Endurance; Gravity Dreams (novella)
The Xeelee Sequence (; ) is a series of hard science fiction space opera novels, novellas, and short stories written by British science fiction author Stephen Baxter. The series spans billions of years of fictional history, centering on humanity's future expansion into the universe, its intergalactic war with an enigmatic and supremely powerful Kardashev Type IV alien civilization called the Xeelee (eldritch symbiotes composed of spacetime defects, Bose-Einstein condensates, and baryonic matter), and the Xeelee's own cosmos-spanning war with dark matter entities called Photino Birds.