时间旅行的概念可是最令人激动的科幻想法,虽然它充满着悖论:诸如如果你回到了过去把你姥爷杀死了,那你又怎么出现呢,那你还怎么回到过去呢?
到现在为止,人们对时间最完善的理解来自爱因斯坦的相对论。在相对论问世的1905年,爱因斯坦说:时间是相对的,当我们以接近或超过光速的运动的时候,时间会很慢或静止,也就是说,如果一个人以接近光速旅行,那么时间对他来说就会停滞,这太令人振奋了,当人乘坐接近光速的飞船去旅行,在旅行的过程中时间就会变慢,因此,当他再回到地球的时候就可能已经过了一个世纪。对他来说,只要花很少的时间就能进入未来世界。(这种穿越方法,在电影《回到未来》中被演示了一番)但是,1905年爱因斯坦的狭义相对论指出:光速无法超越,时间不可能倒流。
说到这里,我们先来看一段电影中的时间旅行研究者的给我们讲述到底时光旅行有多少可能性。
此理论来自《夏日时光机》
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