Abstract
This chapter explains the basis of relativity and discusses the postulates of Einstein's theory. It describes that the velocity of light is constant. Lengths and distances in a moving system are contracted in comparison with the equivalent lengths and distances in an observer's rest frame. The dilation of time at high speeds prompts some exciting speculations concerning the possibility of long-distance space travel. The chapter illustrates the relativistic increase of mass with velocity. It expresses the relationship between mass and energy. According to the Einstein mass–energy relation, any object that possesses mass has associated with it an equivalent amount of energy and vice versa. One of the most fascinating predictions of the general theory concerns the remnants of stellar explosions called supernovas.
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