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Old Nov 17th 2014, 09:36 AM   #11
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Originally Posted by Jerromyjon View Post
Yes, if only it were that easy. It makes me curious that supposedly there is no way to judge motion through space because c is constant for all observers, but if one were to travel as fast as technically possible in a specific direction, and then travel as fast as possible in the opposite direction, wouldn't there be some way to determine what the center of velocity, and therefore some sense of a true "rest" frame? Perhaps out in intergalactic space someday!
In a word: No. You can only define a relative frame and call it inertial ala GR or SR.

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