An unabridged collection spotlighting the best hard science fiction stories and novellas published in 2021 by current and emerging masters of the genre, edited by Allan Kaster.

• "Light up the Clouds" by Greg Egan -- Inhabitants in the floating forests of a gas giant that orbits a dwarf star launch a glider on an orbital trajectory to investigate unnatural asteroid-like objects that threaten their survival.

• "Striding the Blast." by Gregory Feeley -- As a form of punishment, a thief is forced by posthumans to race on a set of wings across a cloud-covered Mercury.

• "Little Animals" by Nancy Kress -- Using entangled quantum effects, a researcher goes back in time and unexpectedly becomes immersed in the life of the daughter of Antonj van Leeuwenhoek.

• "Flowers Like Needles" by Derek Künsken -- A metallic crablike creature living on a planet orbiting a pulsar confronts other warriors in its quest for wisdom.

• "The Planetbreaker's Son" by Nick Mamatas -- Interstellar posthuman emigrants, on a starship the size of a football stadium, grapple with vessel maintenance and family preservation while destroying worlds.

• "Paley's Watch" by Anil Menon -- Fishermen find a peculiar artifact in the Gulf of Alaska that is older than Earth and models the structure of the universe.

• "The Metric" by David Moles -- A billion-year-old ship delivers a message to a far-future Earth that could mean the destruction of space and time.

• "Año Nuevo" by Ray Nayler -- Listless aliens, resembling oversized plastic garbage bags, suddenly disappear thirty years after arriving on a California beachfront.

• "Vaccine Season" by Hannu Rajaniemi -- A boy ventures out to an island to inoculate his secluded grandfather with a transmissible vaccine in a post-pandemic future.

• "Submergence" by Arula Ratnakar -- An investigator uncovers the exploitation of an unusual marine sponge while optogenetically accessing the memories of a scientist who died unexpectedly.

• "Aptitude" by Cooper Shrivastava -- A woman from a slowly dying universe finds herself having to take a rigorous standardized exam after cheating her way into the selection process to become a universe builder.

• "The Egg Collectors" by Lavie Tidhar -- Two wild ballooners, forced to land during an ice storm, discover humming black eggs melting into the ice of Titan's Ligeia Mare.

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• Science Fiction & FantasyScience FictionAnthologies & Short Stories
• Science Fiction & FantasyScience FictionHard Science Fiction

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