KnowraOuter spaceLinked fromLinked fromThe 4 pages that link to Outer space, each with the reason it gives.All 4Related 2Narrower topic 2VacuumNarrower topic: It is a natural low-pressure environment, but not a perfect vacuum.Partial Test Ban TreatyRelated: The treaty’s ban covered nuclear explosions in this environment as well as in the atmosphere.Kármán lineNarrower topic: The line provides a conventional boundary for this otherwise physically gradual transition.Sun RaRelated: Sun Ra transformed space from a physical setting into a symbol of escape and possibility.