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Physics Speed of Light

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Physics Speed of Light
Can you travel faster than the speed of light "c" which is equivalent to 3*10^8 m/s? If so, what happens? What is the light clock theory?
Please do not translate my question into chinese, I need answers.
yyc 1992: I heard that if you go past the speed of light, time ceases to exist for you. in some cases, you actually go back in time.
According to morden relativity theory,you cannot.If so the law of causation will be broken.
I never heard of light clock theory (at least not in English).The thing I know that is closest to this is that in relativity,the speed to light is a constant,so one can use it as a tool to measure length and time.