Imagine sending a time traveling astronaut 100 years into the future. In his book "How to Build a Time Machine," physicist Paul Davies writes, "The theory of relativity implies that a limited form of time travel is certainly possible, while unrestricted time travel - to any epoch, past or future - might just be possible, too." This astonishing statement begs an important question: If time travel did indeed become a reality, how would it affect our world as we currently experience it? But physicists who study time travel today search for plausible ways to create a time warp large enough to allow noticeable travel into the past or future. This means that, in one sense, all of us can already consider ourselves time travelers in a limited way because we experience a tiny time warp (a difference of only nanoseconds) when we, for example, take a flight on an airplane. Thanks to Einstein, scientists know that time slows as moving objects approach the speed of light. But physicists have also explored the nature of time and the plausibility of time travel for more than century, beginning with Albert Einstein's theories of relativity. Wells' "The Time Machine" in 1895 and continuing right up to modern movies like " Déjà Vu" starring Denzel Washington. Science fiction has thoroughly covered the topic of time travel, starting with H.G.
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