If I was on a spaceship traveling almost at the speed of light, my time would slow down relative to the time for a stationary external observer.
My question is, since we measure distances between stars in "light years", those years are relative to the external observer.
The person on the space ship moving almost at the speed of light, would it take 1 year of their time to travel 1 light year, or would they feel like the trip took no time at all because their time slowed down so much relative to the external observer. Who was viewing their ship traveling almost at the speed of light, but who's time was running so much faster than the individuals on the ship.
(yes I know it is impossible to travel at the speed of light, if you would like make it 99.99999999% the speed of light)