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    B Measurements on the entire universe

    I considered "not in causal contact" a vague expression which, unsurprisingly, leads to misunderstanding. It is getting complex here, in part because I have not well elaborated what I asked and in other because of misunderstanding from some. The essence of the topic was; how far can a...
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    B Measurements on the entire universe

    This might drive me away from the question but I am just curious to know. If there is a horizon where no information about the universe could ever reach us, then how do we know that it exits beyond it at any point of time? And if my assumption about its definite states is correct, then how...
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    B Measurements on the entire universe

    So how did we come to know that it is expanding without observing the red shift from those photons?
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    B Measurements on the entire universe

    We wait until every single light photon reaches us. Or to have so many observers everywhere.
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    B Measurements on the entire universe

    Sorry if I still do not see why it is not possible. If the physical reality can not be measured, then it is not a physical reality. Similarly, if the entire universe can not be measured then it is not physical.
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    B Measurements on the entire universe

    I can not claim that I fully understand my own question, but I feel it is worth sharing. Suppose there is a physical system composed of MxN degree of freedom where M is the number of the states and N the number of particles. When a measurement is undertaken, the physical system collapses to...
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