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I apologise if this has already been addressed on the forum, but here goes... If a ship accelerates to say, two thirds the speed of light, while another ship accelerates to the same speed from the opposite direction, are they actually moving towards each other at more than the speed of light? What would a person on each ship see as they approached and as they passed (ignoring the obvious limitations of human sight)? How is this different from a ship moving away from the earth at 1.33... times the speed of light?