swansont Posted March 5, 2019 Share Posted March 5, 2019 1 minute ago, tim.tdj said: The fact that we can be either moving or stationary relative to something as fundamental as the CMB seems to suggest to me that a preferred frame does exist. Is there something I am not understanding here? If yes, I would be very grateful if you could explain it to me. We can always measure a speed with respect to another frame. What we can't do is tell which one is at rest. Are we moving and that frame is at rest, or is it the other way around. A preferred frame is one where the physics tells you that you are definitely at rest. We can do this with accelerations — you can tell if you are accelerating. But not with velocity. Link to comment Share on other sites More sharing options...
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