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Notes -
IIRC- and take this with a grain of salt because my most advanced science class was geology for nonscience majors- every hypothesized FTL drive leaves some kind of telltale signature at the end, too. So even aliens that figured out how to make an alcubierre drive work give off a telltale signature that we should have picked up if they’re anywhere in the neighborhood.
An Alcubierre Drive has a nasty tendency to accumulate all the space dust/debris the vessel encounters along the way, which is eventually liberated eventually, as you need to smooth out the bubble of warped space-time at the end of your journey.
So the braking resembles the blast from a relativistic shotgun, I don't recall figures on the magnitude of the energy released, or carried by the projectiles, but it's probably not a good idea to point it at anything inhabited. Maybe dumping it into a star might work. Either way, I suspect we would notice if it happened anywhere important within the orbit of Pluto.
Yeah, that’s what I was referring to, but I think krasnikov tubes and the fringe-but-math-works hyperspace theories also suggest there’d be some weird anomalies at the exit- and wormholes are a weird and noticeable anomaly.
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