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For questions that require answers based on hard science, not magic or pseudo-science, but do not require scientific citations. Contrast with the hard-science and reality-check tags. Do not use this tag as the only tag on a question.

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The other answers have shown that you can accelerate much faster than you originally planned. This means time saved getting to your destination. If you really want to get to .2c quickly, sci/fi gives …
answered Sep 17 '18 by Andrew Brēza