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May 11, 2012
The “limit” of the speed of light is an observational, or relative to something else, limit. That is, if you stand in your backyard and, looking up at the sky, observe something that is moving extremely fast (relative to you), you will be unable to measure (perceive) its velocity as greater than the speed of light. Also, at that same relative-to-you velocity, you would measure its mass as approaching infinity and, if there were a clock on-board that fast moving object, you would see that clock as nearly standing still.