Can objects in space appear to move backwards in time?

  • Thread starter Matthieu
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In summary, two objects in space are moving away from each other at speeds of 150,000kms/sec and 200,000kms/sec. An observer on one of these objects would see the other object's clock moving slower than their own, but not necessarily "going back in time." The observer would not see the other object moving at the speed of light, as the speeds of the two objects cannot add up to more than c. Instead, the observer's clock would be moving at normal speed and they would see the other object's clock either stop or move very slowly, depending on its speed. To calculate the exact speed at which the observer would see the other object moving away, the addition of velocity theorem and time dilation
  • #1
Matthieu
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Let's assume we have two "somethings" in space, they get away from each others. The speed of one of them is around 150,000kms/sec, very fast but less than the speed of light, the other one goes the totaly opposite way at 200,000kms/sec.

An observer on one of these would see the other element "going back in time" wouldn't he?
 
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  • #2
no, he would just se the other ones clock go slower than his own.
 
  • #3
Wouldn't the observer see the other object flying away at the speed of light? No matter what the speeds of the two objects are their speeds can never add up to more than c, right? So his clock would be moving at normal speed and he would see the other object's clock either stop if it was receding at c, or moving extremely slowly if it was receding at less than that, correct?

Would this observer see the other object moving away at c or slightly less?
 
  • #4
Use addition of velocity theorem and time dilation theorem.
 

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