"Entertaining. . .[Clark] handles both ideas and characters with deftness and wit; in short, the outstanding living science fiction writers is romping".-- "Chicago Sun-Times". In the year 2110 technology has cured most of our worries. But even as humankind enters a new golden age, an amateur astronomer points his telescope at just the right corner of the night sky and sees disaster hurtling toward Earth: a chunk of rock that could annihilate civilization. While a…