An unabridged collection spotlighting the "best of the best" hard science fiction stories published in 2017 by current and emerging masters of the genre, edited by Allan Kaster. In "Shadows of Eternity," by Gregory Benford, a student investigates enigmatic SETI recordings from probes sent to nearby stars despite her teachers' admonishments to stick to the curriculum. An alien robot offers to help save Earth as war and pollution ravage the last of...