这个宇宙中也许其它没有任何东西可以是永恒的，就连曾经被认为恒定的光速也有可能在时光的流逝中改变自己，进而改变宇宙的规律和命运。 光速不变原理是狭义相对论的基础，正是由于光速不变，伟大的爱因斯坦才灵光一现，推导出时间和空间的相对性，即时间和空间都不是? There may not be anything else in this universe that can be eternal. Even the speed of light that was once thought to be constant may change itself in the passage of time and change the laws and fate of the universe. The principle of constant speed of light is the basis of special theory of relativity. It is precisely because the speed of light does not change. The great Einstein was only ashamed of it, deducing the relativity of time and space, that is, neither time nor space.