i was thinking about the idea of traveling light years. say your physically on earth and you want to go to a place that is 500 light years away. you know that the place is soo far away that the light from the star your looking took thousands and thousands or millions years until you could see it....and for all you know that place may not even exist anymore. you decide to go there anyway and it takes just a few days to get there. you visit and come back to earth. did you time travel?
as an object travels at speed it begins to gain mass, the greater the speed the greater the mass of an object. time is relevant to mass, therefore as your mass increases due to speed, time will decrease relative to the craft in comparison to earth time. as the ship decreases speed it looses mass and therefore time increases until it reaches our norm at a near static position.
thank you for all your replies.. i posted this question after reading and listening to various testimonies from people saying they visited other planets, solar systems and galaxies. some say they were gone for a couple of days or even months as [private message for name please] claims. i started wondering what is really happening when one is traveling long distances in space coming from our 3d point of view. thanks again for your interesting replies...