Introduction Towards the end of the nineteenth century, scientists believe that they were close to a complete description of the universe. They imagine dead space was filled by a continuous medium called the "ether". Light ray and radio signals were waves in the ether, just as sound is pressure waves in air. All that was needed for a complete theory were careful measurements of elastic properties of the ether. Fixed ether theory Light wear a wave in a elastic material called ether the speed of light a hire to someone on a spaceship (a) moving towards it and lower on a spaceship (b) travelling in the same direction as the light. As shown in figure below. Can time be the difference for two peoples. Time be the different for two peoples at the same for understanding this statement let's take an example, One version of the twin paradox has been tested experimentally by flying two accurate clocks in op
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