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4 answer(s)

Reply	Jon-Richfield says: The addition of velocities in Einsteinian relativity is subject to the Lorentz–Fitzgerald contraction and those two space ships are not travelling at trans-light speeds relative to each other. They could exchange red-shifted messages, subject to certain practical difficulties.    (no votes) Tags: lightspeed, superluminal.
	posted on 2011-02-17 16:27:46 | Report abuse Reply sid910 says: hey John tell me what was "c"  in e=mc^2 if the speed of light was measured in 1949.  (no votes) Tags: lightspeed, superluminal. posted on 2011-06-05 20:21:33 | Report abuse

Reply	sid910 says: When you travel in a bus of velocity of 5m/s and throw a ball at the speed of 10m/s you might say that the ball has now taken velocity of 15m/s in general. but lorentz equations tell us that that it will actually be moving slower.  (no votes) Tags: lightspeed, superluminal.
	posted on 2011-06-05 20:19:33 | Report abuse

Reply	TresJuicy says: The movement of an object has no bearing on the speed of the light emitted from it. In other words, obect A travels at 3/4 c and fires a laser at object B also travelling at 3/4 c in the other direction. The light then travels at c towards object B travelling at 3/4 c. Object B clearly recieves the light which it never had any chance of "outrunning"  (no votes) Tags: lightspeed, superluminal.
	posted on 2011-11-24 11:34:07 | Report abuse