Welcome to Ringworld, an intermediate step between Dyson Spheres and planets. The gravitational force created by a rotation on its axis of 770 miles per second means no need for a roof. Walls 1,000 miles high at each rim will let in the sun and prevent much air from escaping. Larry Niven's novel, Ringworld, is the winner of the 1970 Hugo Award for Best Novel, the 1970 Nebula Award for Best Novel, and the 1972 Ditmars, an Australian award for Best International Science Fiction.

The Eternals, the ruling class of the Future, had the power of life and death not only over every human being but over the very centuries into which they were born. Past, Present, and Future could be created or destroyed at will. You had to be special to become an Eternal. Andrew Harlan was special. Until he committed the one unforgivable sin - falling in love. Eternals weren’t supposed to have feelings. But Andrew could not deny the sensations that were struggling within him. He knew he could not keep this secret forever. And so he began to plan his escape.

The richest, most depraved man on Earth, Malachi Constant, is offered a chance to take a space journey to distant worlds with a beautiful woman at his side. Of course, there's a catch to the invitation....

For nearly a billion years, every known sentient species in the universe has been the result of genetic and cultural guidance - or "uplifting" - by a previously uplifted patron race. Then humans are discovered. Having already uplifted chimps and dolphins, humanity clearly qualifies as an intelligent species, but did they actually evolve their own intelligence, or did some mysterious patron race begin the process, then suddenly abandon Earth?

In what is considered one of Heinlein's most hair-raising, thought-provoking, and outrageous adventures, the master of modern science fiction tells the strange story of an even stranger world. It is 21st-century Luna, a harsh penal colony where a revolt is plotted between a bashful computer and a ragtag collection of maverick humans, a revolt that goes beautifully until the inevitable happens. But that's the problem with the inevitable: it always happens.

William Mandella is a soldier in Earth's elite brigade. As the war against the Taurans sends him from galaxy to galaxy, he learns to use protective body shells and sophisticated weapons. He adapts to the cultures and terrains of distant outposts. But with each month in space, years are passing on Earth. Where will he call home when (and if) the Forever War ends?

A washed-up treasure hunter, a hotshot racer, and a deadly secret society. They're all on a race against time to hunt down the greatest warship ever built. Some think the ship is lost forever, some think it's been destroyed, and some think it's only a legend, but one thing's for certain: whoever finds it will hold the fate of the universe in their hands. And treasure that valuable can never stay hidden for long....

Bradbury's Mars is a place of hope, dreams, and metaphor - of crystal pillars and fossil seas - where a fine dust settles on the great, empty cities of a silently destroyed civilization. It is here the invaders have come to despoil and commercialize, to grow and to learn - first a trickle, then a torrent, rushing from a world with no future toward a promise of tomorrow. The Earthman conquers Mars...and then is conquered by it, lulled by dangerous lies of comfort and familiarity, and enchanted by the lingering glamour of an ancient, mysterious native race.

Tackling some of humanity’s oldest questions along with new quandaries only he could imagine, these stories will change the way you think, feel, and see the world. They are Ted Chiang at his best: profound, sympathetic, revelatory. Ted Chiang tackles some of humanity’s oldest questions along with new quandaries only he could imagine.

Six million years ago, at the very dawn of the starfaring era, Abigail Gentian fractured herself into a thousand male and female clones: the shatterlings. Sent out into the galaxy, these shatterlings have stood aloof as they document the rise and fall of countless human empires. They meet every 200,000 years to exchange news and memories of their travels with their siblings.