Einstein was not the first to formulate a relativity theory

Einstein was not the first to formulate a relativity theory...

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Einstein was not the first to formulate a relativity theory, however:  Galileo  had  considered the concept in the early seventeenth century. According to Galilean relativity,  the laws of mechanics are useless to an observer in a non-accelerating reference frame  trying to determine whether he or she is moving with respect to another reference frame.  When  Newton  revisited this problem fifty years later, he attempted to solve it by  postulating an "absolute space" eternally at rest, relative to which any reference frame  was either at rest or in motion. However, the fundamental pri nciple of relativity remained  the same: the laws of mechanics are the same in all inertial (non-accelerating) reference  frames, so it is impossible to determine whether an observer in one frame is moving or  stationary with respect to another frame of refe rence. In Einstein's day, physicists questioned whether the relativity principle could be applied 
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Einstein was not the first to formulate a relativity theory...

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