霍金用一个“祖父悖论”的变异，以展示为什么时间旅行可以为宇宙学家带来噩梦。
Hawking USES a variation of the "grandfather paradox" to show why time travel can give cosmologists nightmares.
除此以外，还有“祖父悖论”：如果一个时间旅行者回到过去杀死了仍是孩子的祖父，进而导致了父亲甚至自己都不能出生。将发生什么事情呢？
What would happen if a time traveler killed his grandfather as a child, resulting in his father not being born and, in turn, his not being born.
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