Outer space, or just space, is the void that exists between celestial bodies, including the Earth. It is not completely empty, but consists of a hard vacuum containing a low density of particles, predominantly a plasma of hydrogen and helium as well as electromagnetic radiation, magnetic fields, neutrinos, dust and cosmic rays.

"As a professor of science, I assure you we did, in fact, evolve from filthy monkey-men."
Professor Farnsworth
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