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Aliens, sure, why not, but govt conspiracy, highly doubtful, the govt isn't that good at keeping secrets. I don't think that Einstein ever consider FTL travel, don't think it was something that he was thinking about. But theories are just those, theories, tried tested, but can never be proven to 100%(to become a law of physics such as gravity, etc) and are valid until they are proven wrong. So who knows what could become possible with future research.
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