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How to calculate things directly related to Space Exploration as defined in the help center, or how the calculations have been done in the past or will be done in the future.
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How do you calculate the percentage of light-speed a ship with a certain delta-v can achieve...
In the case where the spacecraft can achieve relativistic speeds and no gravity is involved, $\Delta v$ is actually $c$ times the maximal change of rapidity which can be achieved. So the maximal speed …