For a technological civilization born on a planet as massive as Earth, the easiest way to engage in high-speed interstellar travel might be to hitchhike.
Over the past decade, we discovered several interstellar objects, the biggest and fastest of which is 3I/ATLAS.
An abundant population of objects like 3I/ATLAS — which are larger than a kilometer and faster than 60 kilometers per second, could be viewed as vehicles for interstellar travel. They take less than a billion years to reach stars on a ring around the center of the Milky-Way galaxy.
Like a lower grade Von Neumann probe?
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