Recent content by DAVE OF YORK

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    Calculate the energy of the laser photons

    Hi ! My name is Dave I live in York. U.k. I am only a Particle Extraction Technician (Cleaner). I read that the Universe is expanding outward at 3000 kilometres per second. What bugs me is Einsteine said that the speed of light is constant, I was told that if you shone a torch at the front...