I read that the number of atoms in the entire observable universe is estimated to be within the range of 1078 to 1082.
Does the Universe have finite number of particles? If so, how could it be determined?
Answer
The universe must contain a finite energy - sum of all matter and fields - or the mass-equivalent would collapse within its own gravitation. Said mass-energy is fractionally partitioned among elementary particles and their agglomerates. One then strongly expects there are a finite number of particles including extremely low energy photons and neutrinos.
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