Wormholes allow travel through spacetime from "summary" of A Breif History of Time and the Universe in a Nutshell by Stephen Hawking
Wormholes are theoretical passages through spacetime that could potentially allow for faster-than-light travel between different points in the universe. These hypothetical structures are often depicted as tunnels connecting two separate regions of spacetime, creating a shortcut that bypasses the normal limitations of conventional travel. According to the theory of general relativity, wormholes could exist as solutions to the equations that describe the curvature of spacetime around massive objects. These wormholes would be held open by exotic matter with negative energy density, which would counteract the gravitational forces trying to collapse the passage. While wormholes offer an intriguing possibility for interstellar travel, there are significant challenges to their practical realization. The existence of exotic matter with negative energy density has never been observed, and the stability of wormholes remains a subject of intense ...
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