The Fantasy Review’s list of 7 Hard Science Fiction Books with Thoughtful Themes.
House of Suns by Alastair Reynolds
From the blurb:
Six million years ago, at the dawn of the star-faring era, Abigail Gentian fractured herself into a thousand male and female clones, which she called shatterlings. She sent them out into the galaxy to observe and document the rise and fall of countless human empires. Since then, every two hundred thousand years, they gather to exchange news and memories of their travels…
We Are Legion (We Are Bob) (Bobiverse, #1) by Dennis E. Taylor
From the blurb:
Bob Johansson has just sold his software company and is looking forward to a life of leisure. There are places to go, books to read, and movies to watch. So it’s a little unfair when he gets himself killed crossing the street.
Bob wakes up a century later to find that corpsicles have been declared to be without rights, and he is now the property of the state. He has been uploaded into computer hardware and is slated to be the controlling AI in an interstellar probe looking for habitable planets…
Spin (Spin, #1) by Robert Charles Wilson
From the blurb:
One night in October when he was ten years old, Tyler Dupree stood in his backyard and watched the stars go out. They all flared into brilliance at once, then disappeared, replaced by a flat, empty black barrier. He and his best friends, Jason and Diane Lawton, had seen what became known as the Big Blackout. It would shape their lives…
Contact by Carl Sagan
From the blurb:
The future is here…in an adventure of cosmic dimension. When a signal is discovered that seems to come from far beyond our solar system, a multinational team of scientists decides to find the source. What follows is an eye-opening journey out to the stars to the most awesome encounter in human history. Who—or what—is out there? Why are they watching us? And what do they want with us?…
The Three-Body Problem (Remembrance of Earth’s Past, #1) by Liu Cixin
From the blurb:
Set against the backdrop of China’s Cultural Revolution, a secret military project sends signals into space to establish contact with aliens. An alien civilization on the brink of destruction captures the signal and plans to invade Earth. Meanwhile, on Earth, different camps start forming, planning to either welcome the superior beings and help them take over a world seen as corrupt, or to fight against the invasion. The result is a science fiction masterpiece of enormous scope and vision…
Mission of Gravity by Hal Clement
From the blurb:
Mesklin is a vast, inhospitable, disc-shaped planet, so cold that its oceans are liquid methane and its snows are frozen ammonia. It is a world spinning dizzyingly, a world where gravity can be a crushing 700 times greater than Earth’s, a world too hostile for human explorers. But the planet holds secrets of inestimable value, and an unmanned probe that has crashed close to one of its poles must be recovered. Only the Mesklinites, the small creatures so bizarrely adapted to their harsh environment, can help…
The Forever War (The Forever War, #1) by Joe Haldeman
From the blurb:
The Earth’s leaders have drawn a line in the interstellar sand–despite the fact that the fierce alien enemy they would oppose is inscrutable, unconquerable, and very far away. A reluctant conscript drafted into an elite Military unit, Private William Mandella has been propelled through space and time to fight in the distant thousand-year conflict; to perform his duties and do whatever it takes to survive the ordeal and return home…