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Seems then that wormholes are the only options to travel.
Or what the engine in the ship of the Futurama crew did: not the ship moved but it moved the space around it π
To manipulate the speed of light, like mentioned by Cixin Liu, seems a bit far fetched, too.
Yes, we are still centuries away from having something viable; Of all of them, the most elegant, and the one I like the most, is the idea of ββthe Miguel Alcubierre ship, which distorts space-time in front and behind, fascinatingly.
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