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Interstellar travel is possible through the bending of spacetime from "summary" of The Science of Interstellar by Kip Thorne
In the universe, the fabric of spacetime can be warped and distorted by the presence of massive objects, such as stars and planets. This warping of spacetime is what we commonly refer to as gravity. The more massive an object, the more it warps the spacetime around it, creating a gravitational field. When we talk about interstellar travel, we are essentially discussing the possibility of traveling between star systems or even galaxies. The distances involved in such travel are vast, and the conventional methods of propulsion used for space travel within our solar system are simply not feasible for interstellar journeys. One way to potentially overcome this limitation is by harnessing the bending of spacetime itself. By manipulating spacetime in a controlled manner, it may be possible to create a shortcut through the fabric of the universe, effectively bending spacetime to bring two distant points closer together. This concept is not as far-fetched as it may seem at first glance. In fact, the theory of general relativity, proposed by Albert Einstein, provide...
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