In their last homework, some of my students miscalculated a charge to be $10^{20}$ C over a squared meter and I was wondering if there was as much positive charges in the entire Universe. It would do the trick if I could simply estimate the total number of protons (including those in nucleus) in the entire Universe but how to do so in a simple way ?
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I want to know what happens to the space a black hole crosses over as our galaxy travels through space.
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