imjustcurious
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If two objects are traveling at the speed of light in opposite directions, doesn't this mean that one object is traveling twice the speed of light relative to the other?
Yes, you are right on those points. In all cases it is clear whose clocks and rulers are being used. There is no ambiguity and the answers are correct.Ginosko said:5. In each planet they will see the ship arriving to the other planet in 2.8 seconds. 1 second for the trip plus 1.8 seconds because the image of the arrival of the other ship, will take 1.8 seconds to arrive. That’s because the distance of the two planets.
Yes. That is the separation velocity -- the rate at which the distance between the two ships is increasing. It is not the velocity of any single physical object as measured against an inertial reference frame. So it is not limited to the speed of light.Which are the speed that the inhabitants of the two planets will estimate those two ships flying apart from each other? Is it 0.9 c + 0.9 c for a total of 1.8 c?