Prescient and scientifically accurate, Heart of the Comet is known as one of the great hard SF novels of the 1980s. First published in 1986, it tells the story of an ambitious manned mission to visit Halley's Comet, alter its orbit, and mine it for resources. But all too soon, native cells - that might once have brought life to Earth - begin colonizing the colonists. As factions battle over the comet's future - and that of Earth - only love, courage, and ingenuity can avert disaster and spark a new human destiny.

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.

Karl Cohen, a chemist and mathematician who is part of the Manhattan Project team, has discovered an alternate solution for creating the uranium isotope needed to cause a chain reaction: U-235. After convincing General Groves of his new method, Cohen and his team of scientists work at Oak Ridge, preparing to have a nuclear bomb ready to drop by the summer of 1944 in an effort to stop the war on the western front. What ensues is an altered account of World War II in this taut thriller.

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!

In the New York Times bestseller Extraterrestrial, Avi Loeb, the longest serving Chair of Harvard’s Astronomy Department, presented a theory that shook the scientific community: our solar system, Loeb claimed, had likely been visited by a piece of advanced alien technology from a distant star. This provocative and persuasive argument opened millions of minds internationally to the vast possibilities of our universe and the existence of intelligent life beyond Earth.

Jack Kernigan is having a bad day...a bad year...a bad life. After being booted out of MIT, he’s back in his Ohio hometown, working for the family business, facing a life of mediocrity. Then one day, out on a delivery, his truck hits...something. Something big...something furry...something invisible. And, it turns out, something not of this Earth. Fate can play funny tricks. Which is why Jack suddenly finds himself the planet’s best hope to unravel a conspiracy of galactic proportions that could spell the end of the human race.

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.

From a remote corner of the galaxy, a message is being sent. The continuous beats of a pulsar have become odd, irregular, and artificial. It can only be a code. Frantically, a research team struggles to decipher the alien communication. And what the scientists discover is destined to shake the foundations of empires around this world - from Wall Street to the Vatican.

The Overlords appeared suddenly over every city - intellectually, technologically, and militarily superior to humankind. Benevolent, they made few demands: unify earth, eliminate poverty, and end war. With little rebellion, humankind agreed, and a golden age began.

A major new novel from one of science fiction's most powerful voices, Aurora tells the incredible story of our first voyage beyond the solar system. Brilliantly imagined and beautifully told, it is the work of a writer at the height of his powers.

The Mote In God's Eye is their acknowledged masterpiece, an epic novel of mankind's first encounter with alien life that transcends the genre. No lesser an authority than Robert A. Heinlein called it "possibly the finest science fiction novel I have ever read".

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.

In Search of Schrodinger's Cat tells the complete story of quantum mechanics, a truth stranger than any fiction. John Gribbin takes us step by step into an even more bizarre and fascinating place, requiring only that we approach it with an open mind. He introduces the scientists who developed quantum theory. He investigates the atom, radiation, time travel, the birth of the universe, super conductors and life itself. A fascinating and delightful introduction to the strange world of the quantum - an essential element in understanding today's world.

Harry August is on his deathbed. Again. No matter what he does or the decisions he makes, when death comes, Harry always returns to where he began, a child with all the knowledge of a life he has already lived a dozen times before. Nothing ever changes. Until now. As Harry nears the end of his 11th life, a little girl appears at his bedside. "I nearly missed you, Doctor August", she says. "I need to send a message". This is the story of what Harry does next, and what he did before, and how he tries to save a past he cannot change and a future he cannot allow.

A catastrophic event renders the earth a ticking time bomb. In a feverish race against the inevitable, nations around the globe band together to devise an ambitious plan to ensure the survival of humanity far beyond our atmosphere, in outer space.

From a remote corner of the galaxy, a message is being sent. The continuous beats of a pulsar have become odd, irregular, and artificial. It can only be a code. Frantically, a research team struggles to decipher the alien communication. And what the scientists discover is destined to shake the foundations of empires around this world - from Wall Street to the Vatican.

Strange as it may seem, the gray, oppressive USSR was founded on a fairy tale. It was built on the 20th-century magic called "the planned economy," which was going to gush forth an abundance of good things that the lands of capitalism could never match. And just for a little while, in the heady years of the late 1950s, the magic seemed to be working. Red Plenty is about that moment in history, and how it came, and how it went away. Red Plenty is history, it's fiction, it's as ambitious as Sputnik, and as uncompromising as an Aeroflot flight attendant.

In 1943, LSD is synthesized in Basel. Two decades later, a coterie of grad students at Harvard are gradually drawn into the inner circle of renowned psychologist and psychedelic drug enthusiast Timothy Leary. Fitzhugh Loney, a psychology PhD student, and his wife, Joanie, become entranced by the drug’s possibilities such that their “research” becomes less a matter of clinical trials and academic papers and instead turns into a freewheeling exploration of mind expansion, group dynamics, and communal living.

Robert Charles Wilson, says The New York Times, "writes superior science fiction thrillers." His Darwinia won Canada's Aurora Award; his most recent novel, The Chronoliths, won the prestigious John W. Campbell Memorial Award. Now he tells a gripping tale of alien contact and human love in a mysterious but hopeful universe.

Adam Lang has been Britain’s longest serving—and most controversial—prime minister of the last half century. As pressure mounts for Lang to complete this memoirs, he hires a professional ghostwriter to finish the book. As he sets to work, the ghostwriter discovers many more secrets than Lang intends to reveal, secrets with the power to alter world politics - secrets with the power to kill.

Vergil's innovative experiment restructuring the cells of a common virus becomes a nightmare when, in order to save his research, Vergil injects the entire culture into his bloodstream.

Milo Andret is born with an unusual mind. A lonely child growing up in the woods of Northern Michigan in the 1950s, he gives little thought to his own talent. But with his acceptance at UC Berkeley, he realizes the extent - and the risks - of his singular gifts. California in the '70s is a seduction, opening Milo's eyes to the allure of both ambition and indulgence. The research he begins there will make him a legend; the woman he meets there - and the rival he meets alongside her - will haunt him for the rest of his life.

On September 28th, a geologist working in Death Valley finds a mysterious new cinder cone in very well-mapped area. On October 1, the government of Australia announces the discovery of an enormous granite mountain. Like the cinder cone, it wasn't there six months ago.

Something is happening to planet Earth, and the truth is too terrifying to contemplate

Dr. Kate Philo makes a breathtaking discovery in the Arctic: the body of a man buried deep in the ice. Heedless of the potential consequences, Kate's boss orders that the frozen man be reanimated. As the man begins to regain his memories, the team learns that he was - is - a judge, Jeremiah Rice. Thrown together by fate, Kate and Jeremiah grow closer. But the clock is ticking and Jeremiah's new life is slipping away. Kate must decide how far she is willing to go to protect the man she has come to love.

A quantum physicist shocks the world with a startling experiment, igniting a struggle between science and theology, free will and fate, and antagonizing forces not known to exist. Eric Argus is a washout. His prodigious early work clouded his reputation and strained his sanity. But an old friend gives him another chance, an opportunity to step back into the light.

In the near future, a signal is detected coming from the Alpha Centauri system. Mysterious, unintelligible data streams in for ten years. Heather Davis, a professor in the University of Toronto psychology department, has devoted her career to deciphering the message. Her estranged husband, Kyle, is working on the development of artificial intelligence systems and new computer technology utilizing quantum effects to produce a near-infinite number of calculations simultaneously.

A crippling knee injury forced Elliot Mills to trade in his FBI badge for dusty chalkboards and bored college students. Now a history professor at Puget Sound university, the former agent has put his old life behind him, but it seems his old life isn't finished with him.

In 1943, when the United States learns that Germany is on the verge of a deadly innovation that could tip the balance of the war, the government turns to an unlikely source for help: the nation’s top science fiction writers. Installed at a covert military lab within the Philadelphia Naval Yard are the most brilliant of these young visionaries. The unruly band is led by Robert Heinlein, the dashing and complicated master of the genre. His “Kamikaze Group,” is tasked with transforming the wonders of science fiction into science fact....

Robin Ballantyne's life is finally coming together. After learning she was pregnant with twins and being abandoned by her irresponsible boyfriend, Adam, she's settling into life as a single mother. But one night, after putting the children to bed, she hears an argument and suddenly, a body falls past her window. Running outside, she finds the body of Paula Carmichael, a renowned activist.

Louis Holland arrives in Boston in a spring of ecological upheaval (a rash of earthquakes on the North Shore) and odd luck: the first one kills his grandmother. Louis tries to maintain his independence, but falls in love with a Harvard seismologist whose discoveries about the earthquakes' cause complicate everything.

From a remote corner of the galaxy, a message is being sent. The continuous beats of a pulsar have become odd, irregular, and artificial. It can only be a code. Frantically, a research team struggles to decipher the alien communication. And what the scientists discover is destined to shake the foundations of empires around this world - from Wall Street to the Vatican.

In a cave high in the Alps, a renegade anthropologist discovers a frozen Neanderthal couple with a Homo sapiens baby. Meanwhile, in southern Russia, the U.N. investigation of a mysterious mass grave is cut short. One of the investigators, molecular biologist Kaye Lang, returns home to the U.S. to learn that her theory on human retroviruses has been verified with the discovery of SHEVA, a virus that has slept in our DNA for millions of years and is now waking up.

This science fiction novel describes the epic voyage of the spacecraft Leonora Christine. From practically the very first minute, Tau Zero sets scientific realities in dramatic tension with the very real emotional and psychological states of the travelers, exploring the effect of time contraction due to traveling at near-light speed on the human psyche. This tension is a dynamic that Anderson explores with great success over the course of the novel, as 50 crewmembers settle in for the long journey together.

An experiment has gone terribly wrong. Dr. Peter Hobson has created three electronic simulations of his own personality. One will test life after death; another, immortality. The third one is the control unit. But now all three have escaped from Hobson's computer into the worldwide electronic matrix. And one of them is a killer.

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 a moving story of sacrifice and triumph, human scientists establish a relationship with intelligent lifeforms - the cheela-living on Dragon's Egg, a neutron star where one Earth hour is equivalent to hundreds of their years. The cheela culturally evolve from savagery to the discovery of science, and for a brief time, men are their diligent teachers.

Roger Torraway watched in horror as the monster lurched, toppled over and died. Project Man Plus had gone suddenly and drastically wrong. The race to colonize Mars was too important, too costly, and America was already too committed, for plans to be scrapped. They would have to make a new Martian. And Roger Torraway was it, candidate for the endless surgery, operation after painful operation, that would enable him to survive on that faraway planet.

It is 2019. NASA astronaut Nigel Walmsley is sent on a mission to intercept a rogue asteroid on a collision course with Earth. Ordered to destroy it, he instead discovers that it is actually the shell of a derelict space probe - a wreck with just enough power to emit a single electronic signal….

Thomas Newton is an extraterrestrial, one of only 300 left on his home planet. Using his superior intelligence and skills, Newton amasses a small fortune and a business empire, but soon must battle unexpected foes: the CIA, alcoholism, loneliness, himself. An utterly absorbing psychological study of one man's struggle to survive on 20th-century Earth.

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.

A monstrous apparatus has been found on the surface of the moon. It devours and destroys in ways so incomprehensible to humans that a new language must be invented to describe it and a new kind of thinking to understand it. So far, the human guinea pigs sent there in hopes of unraveling the murderous maze have all died terrible deaths - except the last, now on suicide watch. The ideal candidate won't go insane, even as he feels the end approaching. And now they think they've found their man. Al Barker has already stared into the face of death - he can handle it again.

Vergil's innovative experiment restructuring the cells of a common virus becomes a nightmare when, in order to save his research, Vergil injects the entire culture into his bloodstream.