>Vega (~26 LY away, furthest star anyone on Earth could visit and then return from in a lifetime) It is not necessarily true that more time is spent aboard a s

>Vega (~26 LY away, furthest star anyone on Earth could visit and then return from in a lifetime) It is not necessarily true that more time is spent aboard a ship than light would spend taking the same path, as measured by an external observer. If you had a ship capable of accelerating at 1g indefinitely, then as measured by the crew, they could cross the galaxy in only 24 years. https://en.wikipedia.org/wiki/Space_travel_using_constant_acceleration https://en.wikipedia.org/wiki/Space_travel_using_constant_ac... To an observer who is self-propelled (and has enough energy), the speed of light (as seen by others) is no limit. It's not like you can fire your thrusters and NOT gain momentum and speed; or that, as you accelerate, the stars start passing by at the speed of light, and suddenly your ship jerks, ceasing to accelerate, because you hit an invisible velocity brick wall.