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  • $\begingroup$ For super-long flights, your destination will be mega-light-years from where it was when you started, if it is still existing at all. "OOOps, there USED to be a planet here!!!!!" $\endgroup$ Commented Jun 24, 2022 at 14:37
  • $\begingroup$ At 0.9999999 c there is no actual target of travel. There's a direction and a probability. $\endgroup$
    – Goodies
    Commented Jun 24, 2022 at 16:07