一分钟脑筋急转弯 60-Second Adventures in Thought
祖父悖论 The Grandfather Paradox
时光旅行可能存在吗? Will Time Travel ever be possible?
雷纳 巴雅瓦是一名法国记者兼科幻小说家 Rene Barjavel was a French journalist and science fiction writer
他花了很多时间思考时光旅行的问题 who spent a lot of his time thinking about time travel
1943年 In 1943
巴雅瓦提出了这样一个问题 Barjavel asked what would happen
如果一个人回到了过去 if a man went back in time
在自己父母出生前杀死了自己的祖父 to a date before his parents were born
再与他的祖母约会 会有什么结果? and killed his own grandfather?
如果没有祖父 With no grandfather
那么这个人的父亲或母亲根本就不会出生 one of the man's parents would never have been born
那么杀死祖父的人也根本就不存在 and therefore the man himself would never have existed
这样从一开始就没有人回到过去 So there would be nobody to go back in time
一开始或者最后杀死自己的祖父 and kill the grandfather in the first place or the last place
这就随你怎么看了 depending on how you look at it
"祖父悖论"是哲学 物理学 The Grandfather Paradox has been a mainstay of philosophy
以及整个<回到未来三部曲>的主线 physics and the entire Back to the Future Trilogy
有的人主张时光旅行是可能的 Some people have tried to defend time travel
他们的理由类似于"平行宇宙解决方案" with arguments like the Parallel Universe Resolution
即时光穿梭者引发的变化 in which the changes made by the traveler
创造了一段新的 单独的历史 create a new, separate history
和已有的历史分道扬镳 branching off from the existing one
但大多数人还是接受"祖父悖论" But the Grandfather Paradox prevails
尽管这一悖论只告诉了我们 Although the paradox only suggests
穿越到过去是不可能的 that traveling backwards in time is impossible
但却没有说明是否存在穿越到未来的可能性 it doesn't say anything about going the other way…