What Would Happen If You Traveled At The Speed of Light

Updated: Jan 20, 2018


“Traveling close to the speed of light you would hardly age at all, but your friends and your relatives back home would be aging at the usual rate. When you returned from your relativistic journey, what a difference there would be between your friends and you, they having aged decades, say, and you having aged hardly at all! Traveling close to the speed of light is a kind of [magical potion] of life.”


                                                                                                        - Carl Sagan, Cosmos, pg 218


What Carl Sagan is talking about here is Einstein's theory of special relativity. According to special relativity, when a clock moves through space it will run slower. So for example, if you are walking the busy streets of New York City and you walk past a person who is sitting on a bench, your watch will move slower than h