What a surprise! I have read quite some Asimov, but never one of his stand-alone (that is, non-Foundation, non-Lucky Starr and non-Robot Cycle) science fiction novels. This one is... different. In a good way. The unnatural environment of Eternity(you'll find out what I mean by reading the book) and its effects on the men living in it are perfectly crafted, always coherent and believable. A really enjoyable read....Continua
Published in 1959 this is excellent classic Asimov. I almost loved this more than the Caves of Steel. It was about a society in the far future that had achieved time travel and was able to change the centuries of the future to provide the greatest good for the greatest number of people (kinda like Time Lords if they didn't have the whole non-intervention policy). There was a lot of discussion about the nature of time travel and what was best for humanity. It asked a lot of interesting questions and challenged ideas about society. It had a really fantastic ending which I can't explain without giving anything away but it made perfect sense and was very hopefull. Definitely one I'd highly recommend....Continua
A classic novel of time travel. One of the best by Asimov
"When we moved out into space, the signs were up. Occupied! No Trepassing! Clear Out! Mankind drew back its exploratory feelers, remained at home. But now he knew Earth for what it was: a prison surrounded by an infinity of freedom ... And mankind died out!"...Continua
"Consider how helpless the Primitives must be. They worry about a man killing his own grandfather because they do not understand the truth about Reality.
Take a more likely and a more easily analyzed case and let’s consider the man who in his travels through time meets himself...and the four subdivisions into which such an act can fall. Call the man earlier in physiotime, A, and the one later, B.
Subdivision one, A and B may not see one another, or do anything that will significantly affect one another. In that case, they have not really met and we may dismiss this case as trivial.
Or B, the later individual, may see A while A does not see B. Here, too, no serious consequences need be expected. B, seeing A, sees him in a position and engaged in activity of which he already has knowledge. Nothing new is involved.
The third and fourth possibilities are that A sees B, while B does not see A, and that A and B see one another. In each possibility, the serious point is that A has seen B; the man at an earlier stage in his physiological existence sees himself at a later stage.
Observe that he has learned he will be alive at the apparent age of B. He knows he will live long enough to perform the action he has witnessed. Now a man in knowing his own future in even the slightest detail can act on that knowledge and therefore changes his future.
It follows that Reality must be changed to the extent of not allowing A and B to meet or, at the very least, of preventing A from seeing B. Then, since nothing in a Reality made un-Real can be detected, A never has met B.
Similarly, in every apparent paradox of Time-travel, Reality always changes to avoid the paradox and we come to the conclusion that there are no paradoxes in Time-travel and that there can be none."
Almeno così la pensa Sennor, ma Harlan non ne è poi tanto sicuro......Continua