Is it possible to travel through time? Einstein’s theory of relativity states that the stronger the gravitational pull on an object, the more time slows for that object. Scientists predict that if someone were to travel to a place with a lot of gravity, like near a black hole, time would pass more slowly for that person. In this video excerpt from NOVA’s "The Fabric of the Cosmos: The Illusion of Time," host and theoretical physicist Brian Greene takes a journey through space—and time—to illustrate what time travel might really be like.
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