Robert Silverberg

An expanded version of Asimov's short story, "Nightfall," reveals a world on the brink of chaos, torn between religious fanaticism and scientific denial and faced with the end of civilization

Up the Line is a time travel novel by American science fiction author Robert Silverberg. The plot revolves mainly around the paradoxes brought about by time travel, though it is also notable for its liberal dosage of sex and humor. It was nominated for a Nebula Award for Best Novel in 1969, and a Hugo Award for Best …