Is space 100% empty?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
No, space is not 100% empty. Even in the "emptiest" regions between galaxies, there's approximately one atom per cubic meter. Space also contains: cosmic microwave background radiation, neutrinos, dark matter, gravitational waves, magnetic fields, and virtual particles that briefly pop into existence due to uantum fluctuations. Interstellar space within galaxies contains more matter gas, dust, and stellar winds. Perfect vacuum (absolute emptiness) doesn't exist anywhere in the universe.
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