Divided into three sections, Voices from the Sky delivers a series of enjoyable essays--some prescient, others less so--on topics ranging from spaceflight and communication satellites to the future of human culture as shaped by technological advancement. While many of Clarke's predictions have come to pass, others miss the mark including the elimination of business travel and the obsolescence of cities as a result of video conferencing and a global communications network. So enthusiastic was he about the U.S.A.'s burgeoning space program of the 1960s, that Clarke predicted mankind's expansion to the moon, Mars, and beyond. He could not have known that budget cuts would curtail our space program by the 1990s. Still, Clarke's considerable talents as a science fiction writer and science communicator, combined with his cosmopolitan viewpoint, provide fascinating insights from a time when humanity was just entering the space age. ( )

This brilliant book is divided into three sections. The first is about space travel and other aspects of the new space age, how our concept of time must be modified when we travel long distances, the space seas of tomorrow, uses of the moon, how lower gravity will affect the sports of space colonists, and other fascinating ideas. The second part is about communications satellites, a field in which the author has already played the role of true prophet. The third section ranges widely over the side implications of the space age - scientific meddling, the lunatic fringe and the moral obligations of scientists.

This is a collection of various essays Clarke wrote throughout the 50s, 60s, and 70s, mostly on science and the future of technology. Much of it, sadly, seems hopelessly (even humorously) naive with the benefit of hindsight. Clarke talks enthusiastically about the "certainty" that we will have a lunar colony and a manned mission on Mars by the year 2000, and just in general comes off as overly optimistic about the future. This unfortunately means that most of the essays are hopelessly out of date and are really only of interest as historical curiosities.

The one essay that I really enjoyed was the last one in the book, in which Clarke talks about his various ways of responding to the huge amount of mail he got from crackpots, non-constructive critics, and malcontents. Some of his methods of response are downright hilarious, although they do tend to make one wonder how he has enough time on his hands to come up with them.

In short, I would only recommend this book to the kind of diehard Clarke fan that won't rest until they lay hands on everything he's written. If this doesn't describe you, it's probably best for you to avoid it. ( )