And the miracle it contains does not belong on this Earth.It is mystery and madness -- an enigma with no equal in recorded history. It is mankind's greatest discovery ... and worst nightmare.It may have already obliterated a world. Ours is next.

    NASA, NATO, and the UN sent explorers to the asteroid's surface...and discovered marvels and mysteries to drive researchers mad.For the Stone was from space--but perhaps not our space; it came from the future-but perhaps not our future; and within the hollowed asteroid was Thistledown. The remains of a vanished civilization. A human--English, Russian, and Chinese-speaking--civilization. Seven vast chambers containing forests, lakes, rivers, hanging cities...And museums describing the Death; the catastrophic war that was about to occur; the horror and the long winter that would follow. But while scientists and politicians bickered about how to use the information to stop the Death, the Stone yielded a secret that made even Earth's survival pale into insignificance.

    The title is a play on words, one meaning "the force which pulls" & the other being "extremely serious or important". It was serialized in Astounding Science Fiction, 4–7/53. Its 1st cloth publication was in '54. It was 1st published in paper in '58. Along with the novel itself, many editions (& most recent editions) of the book also include Whirligig World, an essay on creating the planet Mesklin that was published in the 6/53 Astounding. He published two sequels, a '70 novel called Star Light & a '73 short story called Lecture Demonstration. Mission of Gravity was nominated for a Retro Hugo Award for '54.For a profit & adventure Barlennan would sail thousands of miles across uncharted waters, into regions where gravity played strange tricks. He'd dare the perils of strange tribes & stranger creatures--even dicker with those aliens from beyond the skies, though the concept of another world was unknown to the inhabitants of the planet of Mesklin. But in spite of the incredible technology of the strangers & without regard for their enormous size, Barlennan had the notion of turning the deal to an unsuspected advantage for himself--a considerable enterprise for a being very much resembling a 15" caterpillar!

    Spock, and Dr. McCoy struggle to establish new lives apart from each other and the starship. The newly-promoted Admiral Kirk is placed in charge of a specially-created Starfleet division and attempts to defuse a critical hostage situation; Mr. Spock, who, in the midst of a teaching assignment on Vulcan, finds the one thing he least expected; and Dr. McCoy, whose unerring instinct for trouble lands him smack in the middle of an incident that could trigger an interstellar bloodbath.

    In Sargasso of Space, the Solar Queen free traders win exclusive rights to trade with the planet Limbo, but the crew arrives to find most of the planet’s surface charred, with little signs of life. They find a valley with life, but others may still lurk. Worse yet, a strange force threatens to cripple the Queen. They must solve the planet’s mysteries if they hope to escape not only with tradable goods, but their lives.First of the "Solar Queen" adventures, originally published under the pseudonym "Andrew North." This is the second ace edition.

    Each section has a different atmosphere and habitat to cater for the many different species.. all the problems of the staff and patients are in this book.. how to design a spacesuit for a surgeon with eight legs?

    For the first time in one volume: every word Bruce Sterling has ever written on the Shapers-Mechanists Universe.In the last decade, Sterling has emerged a pioneer of crucial, cutting-edge science fiction. Now Ace Books is proud to offer Sterling's stunning world of the Schismatrix--where Shaper revolutionaries struggle against aristocratic Mechanists for ultimate control of man's destiny. This volume includes the classic full-length novel, Schismatrix, plus thousands of words of mind-bending short fiction.

    Linking the disparate human worlds together are diplomats and agents who travel the starways. One of these men is Richard Muller, and now he has the greatest opportunity of his career.Humans at long last have met an intelligent alien species. Muller is sent to make initial contact, but the mission does not go well. Muller is cursed by the aliens. His brain is modified so that his subconscious thoughts radiate from his mind. This makes his presence unbearable to humans. Embittered, he choses to live out his life in an abandoned city of murderous mazes on a long-dead planet.For decades Muller is left alone, but suddenly he is needed again. Humans have made contact with a second and even more dangerous species, one seemingly bent on destroying humanity. The only hope is Muller. His brain can broadcast the thoughts that might convince the aliens that humans are sentient and their equals.A team from Earth make a perilous entry into the maze, confront Muller, and convince him to come to the aid of his former colleagues.

    It was waiting for him, just as he had left it. But where? He only knew he was in the center of a galaxy in a universe of galaxies. Within them lay endless varieties of the planet Earth. And there was only one way to find his Earth again: he would have to visit each one. And he would have to hurry--because his search for home had turned into a race with death.

    It was a simple mission. A standard crew.THE PROBLEMKai and his beautiful co-leader Varian, the best xenob-vet in the business, followed all the standard procedures -- but the results of their investigations were totally unexpected. Not only were the planet's creatures larger than anyone had anticipated and the geological finds smaller, but the rescue ship had inexplicably disappeared.THE NIGHTMAREThen suddenly on a world of giant swamp creatures and deadly predators, a curious change had come over many of the members of the ARCT-10 crew... a change that would lead all of them, in one way or another, into the primitive darkness of a future world.

    . .Captain Pausert thought his luck had finally turned—but he did not yet realize it was a turn for the worse. On second thought, make that a turn for the disastrous*.Unlucky in love, unsuccessful in business, he thought he had finally made good with his battered starship Venture, cruising around the fringes of the Empire and successfully selling off odd-ball cargoes which no one else had been able to sell. He was all set to return home, where his true love was faithfully waiting for him ... he hoped.But then he made the fatal mistake of freeing three slave children from their masters (who were suspiciously eager to part with them). They were just trying to be helpful, but those three adorable little girls quickly made Pausert the mortal enemy of his fiancee, his home planet, the Empire, warlike Sirians, psychopathic Uldanians, the dread pirate chieftain Laes Yango—and even the Worm World, the darkest threat to mankind in all of space.And all because those harmless-looking little girls were in fact three of the notorious and universally feared Witches of Karres.

    Their charter was for a Class III uninhabited planet, which Zarathustra was, and it meant they owned the planet lock stock and barrel. They exploited it, developed it and reaped the huge profits from it without interference from the Colonial Government. Then Jack Holloway, a sunstone prospector, appeared on the scene with his family of Fuzzies and the passionate conviction that they were not cute animals but little people.

    But try living on the mean streets as a child begging for food and fighting like a dog with ruthless gangs of starving kids who wouldn't hesitate to pound your skull into pulp for a scrap of apple. If Bean has learned anything on the streets, it's how to survive. And not with fists. He is way too small for that. But with brains.Bean is a genius with a magician's ability to zero in on his enemy and exploit his weakness.What better quality for a future general to lead the Earth in a final climactic battle against a hostile alien race, known as Buggers. At Battleschool Bean meets and befriends another future commander - Ender Wiggins - perhaps his only true rival.Only one problem: for Bean and Ender, the future is now.Ender's Shadow is the book that launched The Shadow Series, and the parallel novel to Orson Scott Card's science fiction classic, Ender's Game.

    It is the pivot of Marion Zimmer Bradley's novel of Darkover during the final flaming days of the Ages of Chaos.This is the story of the era when the planet of the Bloody Sun was divided into a hundred warring kingdoms and civilization teetered on the edge of oblivion.It is the story of Bard di Asturien, ambitious soldier-outlaw, and of his opponent, Varzil the Good, who struggled to establish the Compact. And it is also the story of a man from distant Terra named Paul Harrell who was the exact duplicate of Varzil's enemy.Two to Conquer is a novel of social forces in combat, of the use and misuse of science, of war, of rape, and of witchcraft.

    Only one weapon—the terrifying Disruptor— can win the struggle for the Empire Forces. But it is so powerful that unless John uses it correctly it could destroy not only the enemy but the cosmos.Could his 20th Century mind cope with the technology of 200,000 years from now?