The great spaceship shuddered briefly as it went into hyperdrive and headed for the Whirlpool Galaxy. Captain Dart watched the hand of the c-meter. It was close to the speed of light, and, getting closer and closer. He felt no change, of course, but he knew that his personal time was already running slow. Each tick of the clock, each heartbeat took months or years of earth time. How old were his friends on earth? he wondered. How long had they been dead?
Such science fiction is not based wholly on imagination. If Captain Dart gets to the Whirlpool Galaxy while he...
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