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The hypothetical (and probably impossible) idea of sending information using or through the fabric of spacetime itself, rather than through it. This includes notions like wormhole comms, quantum entanglement "spooky action" that somehow transmits data, or manipulating gravity waves to carry a signal. It's the dream of instant, non-local chat across the universe, violating the standard light-speed limit by treating space and time as a manipulable medium.

Example: In sci-fi, this is the ansible. A more "physics-y" but still speculative example might be creating and stabilizing two entangled quantum wormholes (Einstein-Rosen bridges), one kept on Earth and one sent to a colony ship. Modulating the quantum state of one instantly affects the other, in theory allowing for faster-than-light messaging. In reality, it's probably a pipe dream that breaks causality, but it's the go-to concept for any story that needs galactic empires to have a functioning internet. It's Spacetime Communication.

By Abzugal

A hypothetical mode of information transfer that bypasses conventional limits of distance and time by using properties of spacetime itself—perhaps via quantum entanglement, wormholes, or gravitational waves. Unlike ordinary communication limited by light speed, spacetime communication would allow signals to reach distant points without delay or to send messages backward or forward in time. It remains firmly in the realm of speculation, though quantum entanglement (which does not allow faster‑than‑light information transfer) often inspires such dreams. Spacetime communication appears in science fiction as “ansibles” or “tachyon relays,” tools for coordinating interstellar civilizations.

Spacetime Communication Example: “The fleet was light‑years apart, but their ansible used spacetime communication to coordinate instantly—a dream that physics may never permit, but one that defines interstellar storytelling.”

By Dumu The Void