"Speculative faster-than-light concepts include the Alcubierre drive, Krasnikov tubes, traversable wormholes, and quantum tunneling.
Some of these proposals find loopholes around general relativity, such as by expanding or contracting space to make the object appear to be travelling greater than c.
Such proposals are still widely believed to be impossible as they still violate current understandings of causality, and they all require fanciful mechanisms to work (such as requiring exotic matter)."
Pretty much every technological advancement human animals have ever made is speculative if you go back far enough in time.
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