The Foundation has managed to preserve humanculture and shorten the period of chaotic barbarism after the Galactic Empire began to decay. But the Foundation still faces great challenges in its struggle to survive.

At last, the costly and bitter war between the two Foundations had come to an end. The scientists of the First Foundation had proved victorious; and now they retum to Hari Seldon's long-established plan to build a new Empire that the Second Foundation is not destroyed after all-and that its still-defiant survivors are preparing their revenge. Now the two exiled citizens of the Foundation-a renegade Councilman and the doddering historian-set out in search of the mythical planet Earth. . .and proof that the Second Foundation still exists. Meanwhile someone-or something-outside of both Foundations sees to be orchestrating events to suit its own ominous purpose. Soon representatives of both the First and Second Foundations will find themselves racing toward a mysterious world called Gaia and a final shocking destiny at the very end of the universe!

In PRELUDE TO FOUNDATION, what happed in the many centuries before the events made famous in Asimov's other Foundation novels - hitherto only hinted at - is now revealed. The Key to the Future It is the year 12,020 G.E. and the last Galactic Emperor of the Autun dynasty, Cleon I, sits uneasily on the throne. These are troubled times and Cleon is desperate to find a way to calm them. When young Outworld mathematician Hari Seldon arrives on Trantor to present a paper on psychohistory, his astounding theory of prediction, the emperor believes that his future security may rest on Seldon's prophetic powers. But Hari Seldon becomes the most wanted man in the Empire as he struggles desperately to keep his remarkable theory from falling into the wrong hands. At the same time he must he must forge the key to the future - a power to be known as the Foundation.

Isaac Asimov's Foundation novels are one of the great masterworks of science fiction. As unsurpassed blend of nonstop action, daring ideas, and extensive world-building, they chronicle the struggle of a courageous group of men and women dedicated to preserving humanity's light in a galaxy plunged into a nightmare of ignorance and violence thirty thousand years long. After years of struggle, the Foundation lies in ruins—destroyed by the mutant mind power of the Mule. But it is rumored that there is a Second Foundation hidden somewhere at the end of the Galaxy, established to preserve the knowledge of mankind through the long centuries of barbarism. The Mule failed to find it the first time—but now he is certain he knows where it lies. The fate of the Foundation rests on young Arcadia Darell, only fourteen years old and burdened with a terrible secret. As its scientists gird for a final showdown with the Mule, the survivors of the First Foundation begin their desperate search. They too want the Second Foundation destroyed…before it destroys them.

The fifth novel in Asimov's popular Foundation series opens with second thoughts. Councilman Golan Trevize is wondering if he was right to choose a collective mind as the best possible future for humanity over the anarchy of contentious individuals, nations and planets. To test his conclusion, he decides he must know the past and goes in search of legendary Earth, all references to which have been erased from galactic libraries. The societies encountered along the way become arguing points in a book-long colloquy about man's fate, conducted by Trevize and traveling companion Bliss, who is part of the first world/mind, Gaia.

For twelve thousand years the Galactic Empire has ruled supreme. Now it is dying. But only Hari Seldon, creator of the revolutionary science of psychohistory, can see into the future -- to a dark age of ignorance, barbarism, and warfare that will last thirty thousand years. To preserve knowledge and save mankind, Seldon gathers the best minds in the Empire -- both scientists and scholars -- and brings them to a bleak planet at the edge of the Galaxy to serve as a beacon of hope for a future generations. He calls his sanctuary the Foundation. But soon the fledgling Foundation finds itself at the mercy of corrupt warlords rising in the wake of the receding Empire. Mankind's last best hope is faced with an agonizing choice: submit to the barbarians and be overrun -- or fight them and be destroyed.

The days of the Empire are numbered. On the Imperial world of Trantor, Cleon II rules over a multitude of worlds slowly descending into anarchy. Two individuals' destinies intertwine in the fight against chaos - Hari Seldon, and Eto Demerzel, a robot and the real power behind Cleon's throne.

《第二基地》是“基地”系列三部曲的最后一部。“谜”一般的第二基地的存在成了众矢之的，骡要铲除它，而第一基地的移民为了一个完全不同的理由也必须找到它，但是它究竟在哪里呢？ 骡倾全力寻找并铲除第二基地，却失败了。随后，基地人员也千方百计寻找第二基地，因为他们不愿把建立新帝国的功业拱手让人。谁也没想到，寻找的线索竟维系在一位小女孩身上。十四岁的艾嘉蒂娅怕得要死，她究竟发现了有关第二基地的什么秘密呢？

《基地与帝国》是“基地”系列三部曲中的第二部。此时，由伟大的心里史学家哈里·谢顿所创立的基地，虽然已在银河外缘立稳了脚跟，但还得面对来自银河帝国的压力。 垂死的帝国仍拥有银河中最强大的武力。一位野心勃勃的将军，率太空舰队攻向基地，聚居在基地小行星上的学者和科学家，能逃过大难的一线希望，全维系在谢顿死前留下的语言中…… 可是，就连谢顿当年也无法预料到：还有比太空军团更具有威胁性的外力已悄然诞生，那就是银河中的突变异种——“骡”。面对骡奇异的心灵力量，即使是一支最坚强的人，也会俯首屈服，成为听话的奴隶。骡的黑色舰队兵不血刃地接受了成立三百多年的历史，为了征服宇宙，骡和忠贞之士都在寻找第二基地，而骡的第一波搜索行动，被一个平凡的女子贝妲阻止，从而为第二基地的反攻计划争取到充分的时间。

当初，心理史学家哈里·谢顿建立基地，并预测人类能在千年间重建银河新帝国。现在，498年过去了，谢顿计划似乎被执行得很完美。 “完美，可能吗”基地人员葛兰·崔维兹表示怀疑。首先，谢顿就不曾预测到“骡”会造成大灾祸。此外，有奇异的力量在继续控制人们的心灵。崔维兹尝试警告大家注意危机，却换得被放逐的下场。他于是开始了奇特的银河查访之旅 同时，第二基地的史陀·坚迪柏也怀疑星际间暗藏着强大的操纵力量。他因此航向太空，尾随崔维兹的查访航迹…… 崔维兹终于发现具备不可思议力量的星球。看来，历史进展早已超越谢顿计划的蓝图。现在，只有他能决定，要抢救计划呢，还是任计划灰飞烟灭？

银河未来的命运决定于某人一念之间，这个就是葛兰·崔维兹。他必须在第一基地，第二基地与盖娅之间做出银河未来由谁主导的决定，由第一基地创建的新帝国将会逞领银河进入科技昌明的世纪，由第二基地指导的新帝国将能确保人类的永久和平，而以盖娅为蓝图的盖娅星系则会是个心灵共同体，所有人类将与万物融合成一个良善的整体。崔维兹直觉地做出了选择，但却无法确定自己的选择是否正确，他怀疑宇宙中还藏有更强大的操纵力量。崔维兹相信地球是解开所有谜团的关键，因为地球是人类的起源母星。奇怪的是，银河中有关地球的资料全都神秘消失。决心查明真正的崔维兹，再次在险恶的群星间漂流，寻觅，究竟两万年前的地球隐藏着什么秘密，崔维兹会改变他的决定吗？

在银河帝国的川陀星球，学者哈里·谢顿在数学十年年会上，透露其“心理史学”理论可以证明人类可以用数学预测未来！搅动了银河系若干星球。帝国皇帝要求他“预测一个好的未来”，谢顿答道：“不可能。”皇帝下令行政长官丹莫茨尔掌控谢顿。为逃避，谢顿在记者夫铭安排下开始在银河系逃亡。在川陀大学，他在穹顶上遇险，在麦曲生星球，竟意外得到秘不示人的典籍，开始接触“朴仆”（机器人）问题，冒险闯入麦曲生人的圣堂，长老阁寻找“朴仆”，触犯大忌，与元首日主十四正面交锋，又是夫铭现身营救。一连串难解的遭遇，躲不开关于“长生不老”的机器人的传说。 难以置信的是“他”就是机器人，更不想到的是谢顿所钟情的“她”也是机器人，一个在人的感染下懂得恋爱的机器人。 本书以“心理史学”为引子，走入银河系，展示了人和机器人分不开理不清的联系，我们不能不问，在银河帝国人和机器人谁主沉浮？

在克里昂一世统治下，第一银河帝国勉强维持最后的统一与繁荣，但帝国国势仍持续衰落。这主要是帝国的政治，经济盘根错李的因素所导致，并非当时任何人所能解决的。克里昂的二任首相哈里·谢顿发展出能预测未来的心理史学，为拯救帝国，他在群星尽头建立起第二基地，与第一基地互为呼应。哈里·谢顿，铎丝·凡纳比里，婉达·谢顿等人身上充满着传奇色彩，情节的发展匪夷所思，但敌对的力量异常强大，鹿死谁手实难预料。他们能使银河帝国复兴吗？结局如何？看来我们只有迈向基地，才能探测个中奥秘。

向来，过去才是历史，昨天才是历史。阿西莫夫却与众不同，他的《基地》系列写的是“未来的历史”，是“遥远未来的历史”，是“明天的历史”！ 阿西莫夫这位“未来历史学家”，这位美国的“太史公”，用“史诗”般的笔触，用“基地”系列宏大的篇章，向读者娓娓动听地讲述了来自“银河帝国”、来自第一基地（通常称为“基地”）和第二基地以及来自那个“骡”的跌宕曲折的故事，把“未来的历史”淋漓尽致地奉献给读者。 《基地》是“基地”系列三部曲中扣第一部。统治银河系达一万两千年之久的银河帝国，已经逐渐走向衰亡。这时间，只有心事史学的一代宗师哈里·谢顿预见未来银河人人将会经历一段长达三万年、充满无知、野蛮和战争的黑暗时期。谢顿于是设立集合帝国中最优秀的科学家，来到银河边缘的一个荒凉行星建立“基地”，期望它能成为未来世代人类的希望灯塔。 然而，随着帝国的逐渐衰微，基地被好战的强邻包围。人类也面临痛苦抉择：向野蛮的势力投降、甘心受控制？还是不顾被摧毁的危险起而奋战？