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" ... A "light clock" will appear to run different for observers moving at different relative speeds, but... [+] this is due to the constancy of the speed of light. Einstein's law of special relativity governs how these time and distance transformations take place between different observers. However, each individual observer will see time pass at a universal rate in their own reference frame: one second per second. ... "
" ... A “light clock” will appear to run different for observers moving at different relative speeds, but ... [+] this is due to the constancy of the speed of light. Einstein’s law of special relativity governs how these time and distance transformations take place between different observers. ... "
" ... An excellent measure of constancy in this case is presented by the Joint Light Tactical Vehicle. JLTV, as it is usually called, is the latest successor to the ubiquitous “jeep” of World War Two. It is a super-rugged light truck designed to safely perform pretty much every military function that lighter or heavier vehicles can’t: tactical mobility, medical evacuation, command and control, reconnaissance, firepower, logistics—the list is long. ... "
" ... If Einstein's General theory of Relativity — which combined Special Relativity and the constancy of the speed of light with gravitation — were correct, then the speed of light can never change as it moves through the Universe. All the different things light can experience, from traveling through curved and expanding space to passing through intervening matter (both normal and dark) to the relative motion of the emitting source and the observer, all affect it, but not by changing its speed. ... "
" ... The thing about adaptability is its constancy, for humans as for all of nature. ... "