use a beam of laser pointing at a satellite A which is 300,000 km from


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送交者: steven 于 2007-06-13, 02:13:35:

回答: More detail, please... 由 蓝隼 于 2007-06-13, 01:28:10:

earth, the laser meet the sat and forms a lightspot. Let there be another satellite B at the same orbit but is 180 degree from A, you rotate the laser beam from A sat to B sat. The lightspot moves from A to B. That spot travales about 3 times of the speed of light. However, since there cannot be any information carry by the spot from A to B, that means no energy associate with the movement of the spot from A to B, (there is energy transfer from O where the laser beam originated, to both A, and B, and it takes exactly the speed of light), this movement does not violate special relativity.



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