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What about considering the microwave background radiation (2.7K if I remember well) as a reference system with some absolute character? Please explains if this question make sense and possible answers. Thank you.

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Yes, this is a frame prominently used in cosmology. Still, one may neglect the weak CMB (or shield a system from it) to see that all other frames in relative motion with respect to the CMB frame still follow the same laws of physics. – Luboš Motl Nov 16 '11 at 14:31

No more absolute than using the position of distant Quasars

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