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## Main Question or Discussion Point

I am confused!

Fermi particles cannot occupy the same quantum state simultaneously. When considering quantum states in solid material, I was taught that in solid material, an electron occupies one quantum state and then many electrons occupy lower states making Fermi sea. Then, is this situation correct when considering quantum states in the universe, i.e., in vacuum? This seems to conclude that the number of electrons with a specific quantum state is only one in the universe!

Fermi particles cannot occupy the same quantum state simultaneously. When considering quantum states in solid material, I was taught that in solid material, an electron occupies one quantum state and then many electrons occupy lower states making Fermi sea. Then, is this situation correct when considering quantum states in the universe, i.e., in vacuum? This seems to conclude that the number of electrons with a specific quantum state is only one in the universe!