indeed what Freet guesses is true
information sent out by a ship travelling at the speed of light will be meaningless by the doppler shift. If the ship moves away from us, the observed frequency will be 0, so no signal can be sent out.
But lets solve all these problems and say that the ship travels at 0.9c. Then indeed compared to the ships videotapes, the timescale would be different, but compared to a normal observer on earth nothing will change; this is because while the space ship travels to alpha centauri, als the time scale on the ship changes in respect to that on alpha centauri. The net difference is exactly zero.
Bo
