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Suppose that there are two points in an empty space A and B and observers at A and B having clocks:

  • If A were to be traveling near speed of light, when clock at A passes 1 hour, observer at A observes that clock at B passes more than 1 hour, say 5 hours.
  • If B were to be traveling near speed of light, then when clock at B passes 1 hour, observer at B observes that clock at A passes 5 hours.

Velocity is relative, however A or B can observe each others clock and can come to a conclusion whether they are the one traveling near speed of light?

Apparently I am confusing something here, can you point it out?

Qmechanic
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CuriousCrypto
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1 Answers1

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You are overlooking the fact that speed is relative and time dilation is symmetric. When you say that A is travelling at near the speed of light- relative to what? Do you mean relative to B? If so, then B is travelling at near the speed of light relative to A. There is no difference between the two ways of describing the relative motion of A and B- you can say A is moving relative to B or B is moving relative to A- they both mean the same thing.

Professor Sushing
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