This is an excellent, though lengthy explanation of the Michelson-Morley Experiment which destroyed the theory of the existence of an ether. Light was supposed to move immersed in that ether, and its speed would have been relative to it: Michelson-Morley Experiment If you make a search on the phrase "front of a tank", you will see a good explanation of independence of the light speed respect to the source of emmission. According to general relativity, at speeds near the speed of light, not only the mass tends to infinite, but also time tends to lenghten, and space tends to SHRINK ! At a reasonable speed, it would not be bad to gain some pounds but be able to live longer and travel further. At least, Nature gives as a hint. Un abrazo, Andrés
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