A common theme in science fiction media, time travel fascinates. The late philosopher David Lewis defined it in his essay The Paradox of Time Travel:[involving] gap between time and space-time. Travelers depart and then arrive at their destination. Elapsed time from departure to arrival … is the duration of the journey. ”

Time travel is commonly understood as returning to a bygone era or jumping to a point in the future. But how many of the ideas are based in reality? Is time travel possible?

Is time travel possible?

NASA says time travel is possible, but not in the way you would expect. Albert According to Einstein’s theory of relativity, time and motion are relative to each other, and nothing can go faster than the speed of light, which is 186,000 miles per second. Time travel occurs through so-called “time dilation”.

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