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Outer space, often simply called space, refers to the relatively empty regions of the universe outside the atmospheres of celestial bodies.

Popular understandingEdit

Contrary to popular understanding, outer space is not completely empty (i.e. a perfect vacuum) but contains a low density of particles, predominantly hydrogen plasma, as well as electromagnetic radiation.

ConceptsEdit

Outer space is used to distinguish it from airspace (and terrestrial locations).

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