Interstellar travel will depend on the development of new physics. Rocket-based technology will never do it. Voyager 1 will take 25000 years to pass out of the oort cloud, let alone arrive at another system! There is a finite possibility of subatomic particles being anywhere in the universe, but this will have to be translated to a macroscopic scale, in a fully controllable way. This is still probably centuries away! Therefore any discussion of visiting other systems is purely academic at present.
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