Dear All, Velocity of light is always constant (except for they that are studiyng exceptions to this norma), but I'm doing a mental experiment that has problems. To go to one star, I must first accelerate me (like i was a particle) and then go to the constant velocity "c". Then, when I arrive, i must to decelerate to 0. This is in a straigh line. The question is much dificult if I try to develope the same trip, but not in straigh line. Has anybody information about this (in ausence of any influence)? best reggards.