I was reading some articles on the internet, about scientists being able create space ships capable of nearing the speed of light, some time in the future. So say they did do this and managed to reach around 0.9999999% of the speed of light and wanted to travel to the nearest star which, to keep it simple, is 1 light year away. Meaning it would take one year to reach the star. But my question is; is this one earth year, or one year from the crews point of view. Because at such speeds time dilation would mean that 1 day for the crew would be nearly 20,000 years on earth. Hence, if it is one earth year then surely the journey time for the crew, to get to the nearest star, would be only 4.32seconds. Assuming that one day is 86,400 seconds and that lasts 20,000 years, then proportionatly one year lasts 4.32 seconds. Obviously, if the journey was a year from the crews perspective then 7.3 million years would have passed by the time they reached the star which would be very impractical. So if you could travel one light year to the nearest star would the journey last a year in earth time or a year from the space ships view?