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Chronos
#4
Feb6-05, 10:32 PM
Sci Advisor
PF Gold
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P: 9,454
Solution to why the speed of light is measured the same by all inertial observers.

I'm not sure the planck length would necessarily be invariant, but the planck energy might qualify. In any case, I think you must have at least two invariant constants to establish covariance.