Best Free Books by Hard Science Fiction

Fly Me To The Moon

by KERRY DILLON

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Genre Shelves: Action Thriller Fiction Hard Science Fiction

The Lead Cloak

by Erik E. Hanberg and Erik Hanberg

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Genre Shelves: Science Fiction Adventure Hard Science Fiction

Maverick Gambit

by Marjorie King

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Genre Shelves: Hard Science Fiction Colonization Science Fiction eBooks Western Science Fiction

The Dream Keeper: A Supernatural Suspense Thriller Novel

by A. B. Cohen

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Genre Shelves: Metaphysical Science Fiction eBooks Hard Science Fiction Crime & Mystery Science Fiction

Peace Keeper

by Paul Haedo

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Genre Shelves: Space Fleet Science Fiction eBooks Hard Science Fiction Space Marine Science Fiction eBooks

Scarcity

by Robert Calbeck

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Genre Shelves: Science Fiction Adventure Dystopian Science Fiction Hard Science Fiction

Day 115 on an Alien World

by Jeannette Bedard

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Genre Shelves: Space Exploration Science Fiction eBooks Hard Science Fiction Colonization Science Fiction eBooks

Exodus

by Andreas Christensen

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Genre Shelves: Space Opera Science Fiction Space Fleet Science Fiction eBooks Hard Science Fiction

Quantum Whispers: Book 1 of the Quantum Ascension Series

by Alex M Brandt

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Genre Shelves: Alien Invasion Science Fiction eBooks Hard Science Fiction Military Science Fiction

Contain: The Post-Apocalyptic Survival Thriller

by Saul Tanpepper

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Genre Shelves: Psychological Fiction Hard Science Fiction U.S. Horror Fiction

Genre Shelf: Hard Science Fiction