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if you are at point A observing point B, you are seeing point B as it was when it emitted the light that is reaching you.
if you travel to point B faster than the speed of light, you will reach B before the light from B reached you. therefore you will be at B at a point in time earlier than what you observed.
it implies time travel because under no other circumstances would you be able to have information on the time in B's history before its light reached you.
