At an astronomical meeting, it is reported two galaxies had been detected, approaching each other with speeds of 0.700c and 0.600c (relative to the Earth), respectively. As a cub reporter, you are tempted to rush out and report that something traveling faster than the speed of light has been discovered, that is, the distance between the galaxies is shrinking at a rate of 1.30c. But hold on! Upon further thought, you realize that this event does not violate the laws of physics (relativity). How would you rewrite your story explaining why the separation shrinkage rate exceeding c is not inconsistent with the prediction of relativity?

  • CreatedAugust 29, 2015
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