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.

It's been centuries since the robots of Panga gained self-awareness and laid down their tools; centuries since they wandered, en masse, into the wilderness, never to be seen again; centuries since they faded into myth and urban legend. One day, the life of a tea monk is upended by the arrival of a robot, there to honor the old promise of checking in. The robot cannot go back until the question of "what do people need?" is answered. But the answer to that question depends on who you ask, and how.

The starship Starfarer is poised for our first voyage to another star system. The Alien Contact Team - physicist Victoria Fraser MacKenzie, geneticist Stephen Thomas Gregory, geographer Satoshi Lono, and alien contact specialist J.D. Sauvage - and the rest of the faculty and staff prepare for humanity's most ambitious exploratory expedition. But the world has changed. A new regime orders the vessel to be abandoned. It will be turned into an instrument of war. What do the Starfarers do? They do what any red-blooded Alien Contact Team would do. They steal the starship.

The imperious Winter colonists have ruled the planet Tiamat for 150 years, deriving wealth from the slaughter of the sea mers. But soon the galactic stargate will close, isolating Tiamat, and the 150-year reign of the Summer primitives will begin. All is not lost if Arienrhod, the ageless, corrupt Snow Queen, can destroy destiny with an act of genocide. Arienrhod is not without competition as Moon, a young Summer-tribe sibyl, and the nemesis of the Snow Queen, battles to break a conspiracy that spans space.

Imperial Intelligence couldn't find them, the Imperial Fleet couldn't catch them, and local defenses couldn't stop them. It seemed the planet-wrecking pirates were invincible. But they made a big mistake when they raided ex-commando leader Alicia DeVries' quiet home/work, tortured and murdered her family, and then left her for dead. Alicia decided to turn "pirate" herself, and stole a cutting-edge AI ship from the empire to start her vendetta. Her fellow veterans think she's gone crazy, the Imperial Fleet has shoot-on-sight orders. And, of course, the pirates want her dead, too.

Marra never wanted to be a hero. As the shy, convent-raised, third-born daughter, she escaped the traditional fate of princesses, to be married away for the sake of an uncaring throne. But her sister wasn’t so fortunate—and after years of silence, Marra is done watching her suffer at the hands of a powerful and abusive prince. Seeking help for her rescue mission, Marra is offered the tools she needs, but only if she can complete three seemingly impossible tasks:

Adrian Tchaikovksy's critically acclaimed stand-alone novel Children of Time is the epic story of humanity's battle for survival on a terraformed planet. Who will inherit this new Earth? The last remnants of the human race left a dying Earth, desperate to find a new home among the stars. Following in the footsteps of their ancestors, they discover the greatest treasure of the past age - a world terraformed and prepared for human life. But all is not right in this new Eden.

God is change. That is the central truth of the Earthseed movement, whose unlikely prophet is 18-year-old Lauren Olamina. The young woman's diary entries tell the story of her life amid a violent 21st-century hell of walled neighborhoods and drug-crazed pyromaniacs - and reveal her evolving Earthseed philosophy. Against a backdrop of horror emerges a message of hope: if we are willing to embrace divine change, we will survive to fulfill our destiny among the stars.

To the Apaches, Daniella Blackwood was an adopted daughter, respected and cherished. To their shaman, the bold white streak in her hair made her special and her visions in the flames make her a woman of magic. Yet no magic could protect Daniella from the passion that sears her senses when she first meets Travis Colton.

This is the way the world ends...for the last time. It starts with the great red rift across the heart of the world's sole continent, spewing ash that blots out the sun. It starts with death, with a murdered son and a missing daughter. It starts with betrayal, and long dormant wounds rising up to fester. This is the Stillness, a land long familiar with catastrophe, where the power of the Earth is wielded as a weapon. And where there is no mercy.

This lush novel, set in 1766 England and America, evokes an era ripe with riot and revolution, from the teeming streets of London to the sprawling grounds of a Virginia plantation. Mack McAsh burns with the desire to escape his life of slavery in Scottish coal mines while Lizzie Hallim is desperate to shed a life of sheltered subjugation to her spineless husband. United in America, their only chance for freedom lies beyond the Western frontier - if they're brave enough to take it.

Helene Wecker's dazzling debut novel tells the story of two supernatural creatures who appear mysteriously in 1899 New York. Chava is a golem, a creature made of clay, brought to life by a strange man who dabbles in dark Kabbalistic magic. When her master dies at sea on the voyage from Poland, she is unmoored and adrift as the ship arrives in New York Harbor. Ahmad is a jinni, a being of fire, born in the ancient Syrian Desert. Trapped in an old copper flask by a Bedouin wizard centuries ago, he is released accidentally by a tinsmith in a Lower Manhattan shop.

Tom Hazard has a dangerous secret. He may look like an ordinary 41-year-old, but owing to a rare condition, he's been alive for centuries. Tom has lived history - performing with Shakespeare, exploring the high seas with Captain Cook, and sharing cocktails with Fitzgerald. Now, he just wants an ordinary life. So Tom moves back his to London, his old home, to become a high school history teacher - the perfect job for someone who has witnessed the city's history first hand. Better yet, a captivating French teacher at his school seems fascinated by him.

On the Day of Reckoning, the witches of Eileanan were outlawed - and violations of the new order were punishable by death. Eileanan’s Great Towers, once meccas of magic and learning, were left in ruins. And now, the entire land trembles in fear. Yet deep in the mountains, in the shadow of Dragonclaw, a young girl is being tutored in the old ways. Ignorant of her past, uncertain of her future, the foundling Isabeau will soon be forced down a dangerous path of prophecy, conspiracy, and magic.

The sudden rising waters of a climate apocalypse have destroyed most of the planet…yet out of these waters, Dinétah, a former Navajo reservation, has been miraculously reborn. Listen along as Tanis Parenteau's impeccable narration, capturing the rhythms of Navajo speech, fully envelopes you into the Sixth World. Trail of Lightning follows our heroine as she walks the land alongside gods, heroes of legend, and monsters alike.

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?

When prospector Bob Broadhead went out to Gateway on the Heechee spacecraft, he decided he would know which was the right mission to make him his fortune. Three missions later, now famous and permanently rich, Robinette Broadhead has to face what happened to him and what he is...in a journey into himself as perilous and even more horrifying than the nightmare trip through the interstellar void that he drove himself to take!

Collected in one volume is all three books in C. J. Cherryh's epic The Faded Sun trilogy: Kesrith, Shon'jir, and Kutath.

In this Hugo Award-winning classic, Enoch Wallace is an ageless hermit, striding across his untended farm as he had done for over a century, still carrying the gun with which he had served in the Civil War. But what his neighbors must never know is that, inside his unchanging house, he meets with a host of unimaginable friends from the farthest stars.

The imperious Winter colonists have ruled the planet Tiamat for 150 years, deriving wealth from the slaughter of the sea mers. But soon the galactic stargate will close, isolating Tiamat, and the 150-year reign of the Summer primitives will begin. All is not lost if Arienrhod, the ageless, corrupt Snow Queen, can destroy destiny with an act of genocide. Arienrhod is not without competition as Moon, a young Summer-tribe sibyl, and the nemesis of the Snow Queen, battles to break a conspiracy that spans space.

Only a few know the terrifying truth - an outcast Earth scientist, a rebellious alien inhabitant of a dying planet, a lunar-born human intuitionist who senses the imminent annihilation of the Sun... They know the truth - but who will listen? They have foreseen the cost of abundant energy - but who will believe?These few beings, human and alien, hold the key to the Earth's survival.

Niblock House is a rising executive at General Technics, one of a few all-powerful corporations. His work is leading General Technics to the forefront of global domination, both in the marketplace and politically - it's about to take over a country in Africa. Donald Hogan is his roommate, a seemingly sheepish bookworm. But Hogan is a spy, and he's about to discover a breakthrough in genetic engineering that will change the world...and kill him. Society is squeezed into hive-living madness by god-like mega computers and mass-marketed psychedelic drugs.

Have you ever worried about your memory, because it doesn't seem to recall exactly the same past from one day to the next? Have you ever thought that the whole universe might be a crazy, mixed-up dream? If you have, then you've had hints of the Change War.

Pell's Station, orbiting the alien world simply called Downbelow, had always managed to remain neutral in the ever escalating conflict between The Company, whose fleets from Earth had colonized space, and its increasingly independent and rebellious colony worlds. But Pell's location - - on the outer edge of Earth's defensive perimeter - makes her the focal point in the titanic battle of colony worlds fighting for independence.

The saga of two young friends trapped in an endless nightmare of suspicion and surveillance, of cyber-programmed servants and a ruling class with century-long lives – and the enigmatic woman who dominates them all.

Babel-17, winner of the Nebula Award for best novel of the year, is a fascinating tale of a famous poet bent on deciphering a secret language that is the key to the enemy's deadly force, a task that requires she travel with a splendidly improbable crew to the site of the next attack.

One minute, down-and-out actor Lorenzo Smythe is, as usual, in a bar, drinking away his troubles while watching his career circle the drain. Then a space pilot buys him a drink, and the next thing Smythe knows, he’s shanghaied to Mars. Smythe suddenly finds himself agreeing to the most difficult role of his career: impersonating an important politician who has been kidnapped. Peace with the Martians is at stake, and failure to pull off the act could result in interplanetary war.

Father Ruiz-Sanchez is a dedicated man - a priest who is also a scientist, and a scientist who is also a human being. He has found no insoluble conflicts in his beliefs or his ethics...until he is sent to Lithia. There he comes upon a race of aliens who are admirable in every way except for their total reliance on cold reason; they are incapable of faith or belief. Confronted with a profound scientific riddle and ethical quandary, Father Ruiz-Sanchez soon finds himself torn.

A Fire Upon the Deep is the big, breakout book that fulfills the promise of Vinge's career to date: a gripping tale of galactic war told on a cosmic scale. Thousands of years hence, many races inhabit a universe where a mind's potential is determined by its location in space, from superintelligent entities in the Transcend, to the limited minds of the Unthinking Depths, where only simple creatures and technology can function.

Three remarkable journeys into the stars: Worlds of Exile and Illusion includes Rocannon's World, Planet of Exile, and City of Illusions. These three spacefaring adventures mark the beginning of grand master Ursula K. Le Guin’s remarkable career. Set in the same universe as Le Guin’s groundbreaking classics The Left Hand of Darkness and The Dispossessed, these first three books of the celebrated Hainish series follow travelers of many worlds and civilizations in the depths of space.