If/when humans send a mission to Alpha Centauri, will the subjective time experienced by the craft be more than 20 years?
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Alpha Centauri is about 4 light years away. Time dilation means that if the craft accellerates fast enough, the time it experiences can be arbitrarily low; possibly even less than 4 years.
See here for various theoretical methods and how long they would take.
Close date updated to 2200-01-01 12:00 am
This question is managed and resolved by Manifold.
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