Quote:
Originally Posted by KimB
If you travel to the nearest star (which is 4 llight years away) at the speed of light It would take 4 years. But is that 4 years ship time or 4 years for someone on the earth assuming you could know instantly when they had got there?
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4 years for someone on earth. Travelling at c, the ship would experience no time for the trip (this assumes there is no acceleration or deceleration time, getting to and stopping from c.)