Suppose we are told that the linear size of everything in the universe has been doubled overnight. If we are told to measure the sizes, what will we do. I don't think we are going to measure everything by scale. What should we do to check the truth of statement then? In my view i think that speed of light is not changed,so if we use it to measurement, it's gonna helpful. The problem arises when i thought what will happen if time start running at half the speed? I m stuck here now
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