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A comment on Physics Has Demoted Mass. Parent comment

Re:Physics Has Demoted Mass by jessriedel on Sunday November 12, 2017 @11:21AM (#15681311)
Mass and energy are not the same property at all. E=mc^2 is only applicable at the limit of zero speed.
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Re:Physics Has Demoted Mass by jschwartzi on Sunday November 12, 2017 @12:42PM (#15681678)
...In the same frame of reference as the observer.
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