Abstract

To observe moving objects, the speed of light is defined as the speed of photons relative to its source, and the propagation characteristics of light in pure space and a medium are introduced in this paper. New concepts called the moving space-time coordinate, the visual space-time coordinate, and the static space-time coordinate are proposed. This paper derives the relationship among the three in pure space and in a moving medium. It is concluded that the moving objects observation theory has solved the measurement problem of moving objects. Movement cannot cause changes in length, time, and mass. Moreover, there is not any light speed barrier.