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A space ship moving at a constant .9 c traveses the distance between two inertial reference frames that are .9 light years apart (about 5.4 trillion miles). An observer at a stationary reference point clocks the event at 1 year. But, due to the dilation effects, the ships clocks shows only .44 years. Assume for this example that reference frames are stationary. Since distance and velocity are constant here, how can can v = ds/dt be valid

from the ship's perspective ? Does the ship recognize that it has traveled the 5.4 trillion miles in only .44 light years. I realize that I'm really missing something here.