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Imagine hitching a ride on a super-fast spaceship that zips through the cosmos at near-light speed. Thanks to Einstein's theory of relativity, time would slow down for you while you zoom away. When you return, you'd find that while you aged just a bit, everyone back on Earth has aged much more. If you dare venture near a black hole, its intense gravity could bend time itself. As you approach the event horizon (that ominous point of no return), time dilation kicks in. Hours for you might translate into years for those watching from a safe distance. And these aren't the only way to time travel - pick yours!