Relative speeds haven't been too much thought... Or I haven't red anything yet...
Not sure what is speed difference between different star systems around galaxy.
Relative travel is also intresting, if it happens in huge scale. Have anyone considered the lifespan of ship in such enviroment, desing of ship might be millenias old while ship is still only few decades... Or the hyperspace communications and minor relative time differences. Where do you center time for example as everything is relative?
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