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.

A retired group of legendary mercenaries get the band back together for one last impossible mission in this award-winning debut epic fantasy. Clay Cooper and his band were once the best of the best, the most feared and renowned crew of mercenaries this side of the Heartwyld. Their glory days long past, the mercs have grown apart and grown old, fat, drunk, or a combination of the three. Then an ex-bandmate turns up at Clay's door with a plea for help - the kind of mission that only the very brave or the very stupid would sign up for. It's time to get the band back together.

Vannemar Morgan's dream is to link Earth to the stars with the greatest engineering feat of all time: a 24,000-mile-high space elevator. But first he must solve a million technical, political, and economic problems while allaying the wrath of God. For the only possible site on the planet for Morgans Orbital Tower is the monastery atop the Sacred Mountain of Sri Kanda.

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.

When the Chosen One dies seconds from victory, the future falls into the hands of his younger sister. Disabled since childhood, Elenor never expected to be thrust into the center of a vast political web, but now her choices threaten to unravel it. As she navigates treacherous strands of deception, Elenor must forge alliances, confront sadistic family members, and uncover mysteries that span centuries. The world teeters on the brink of chaos, magic spirals out of control, and ancient forces move in the shadows hungry for vengeance.

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.

Vannemar Morgan's dream is to link Earth to the stars with the greatest engineering feat of all time: a 24,000-mile-high space elevator. But first he must solve a million technical, political, and economic problems while allaying the wrath of God. For the only possible site on the planet for Morgans Orbital Tower is the monastery atop the Sacred Mountain of Sri Kanda.

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.

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!

Startling, unusual, and yet irresistably readable, Among Others is at once the compelling story of a young woman struggling to escape a troubled childhood, a brilliant diary of first encounters with the great novels of modern fantasy and SF, and a spellbinding tale of escape from ancient enchantment.

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.

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?

The half-mad Prince Boleso has been slain by a noblewoman he had intended to defile. It falls to Lord Ingrey kin Wilfcliff to transport the prince to his burial place and to bring the accused killer, Lady Ijada, to judgment. The road he travels with his burden and his prisoner is fraught with danger. But in the midst of political chaos, magic has the fiercer hold on Ingrey's destiny, and Ijada herself may turn out to be the only one he dares trust.

Anderson Lake is a company man, AgriGen's Calorie Man in Thailand. Under cover as a factory manager, Anderson combs Bangkok's street markets in search of foodstuffs thought to be extinct, hoping to reap the bounty of history's lost calories. There, he encounters Emiko...Emiko is the Windup Girl, a strange and beautiful creature. One of the New People, Emiko is not human; instead, she is an engineered being, creche-grown and programmed to satisfy the decadent whims of a Kyoto businessman.

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.

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.

The Shadow of the Torturer is the first volume in the four-volume epic, the tale of a young Severian, an apprentice to the Guild of Torturers on the world called Urth, exiled for committing the ultimate sin of his profession - showing mercy towards his victim.

Gene Wolfe's "The Book of the New Sun" is one of speculative fiction's most-honored series. In a 1998 poll, Locus Magazine rated the series behind only "The Lord of the Rings" and The Hobbit as the greatest fantasy work of all time.

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.

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.

Leo Graf was just your average highly efficient engineer: mind your own business, fix what's wrong, and move on to the next job. But all that changed on his assignment to the Cay Habitat, where a group of humanoids had been secretly, commercially bioengineered for working in free fall. Could he just stand there and allow the exploitation of hundreds of helpless children merely to enhance the bottom line of a heartless mega-corporation?