No matter how fast an observer is moving or how fast a light-emitting object is moving, a measurement of the speed of light always yields the same result. Second, light travels at an unvarying speed of 186,000 miles a second.Einstein recognized that if the motion is perfectly uniform, it's literally impossible to tell - and identified this as a central principle of physics. It’s a bit like when you look out a train window and see an adjacent train appear to move - but is it moving, or are you? It can be hard to tell. As long as an object is moving in a straight line at a constant speed (that is, with no acceleration), the laws of physics are the same for everyone. First, the natural world allows no “privileged” frames of reference.
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