Outer space, also called just space, refers to the relatively empty regions of the universe outside the atmospheres of celestial bodies. Outer space is used to distinguish it from airspace (and terrestrial locations). Contrary to popular understanding outer space is not empty but contains a low density of particles, predominantly hydrogen gas as well as electromagnetic radiation.

There is no discrete boundary between the Earth's atmosphere and space as the atmosphere gradually attenuates with increasing altitude. If the atmosphere had a constant temperature, its pressure would decrease exponentially from a sea-level value of 100 kPa (1 bar) toward its final value of zero. The Federation Aeronautique Internationale has established the Kármán line at an altitude of 100 km (62 miles) as a working definition for the boundary between atmosphere and space. The astronauts. During re-entry, 400,000 feet (75 miles or 120 km) marks the boundary where atmospheric drag">atmospheric reentry">re-entry, 400,000 feet (75 miles or 120 km) marks the boundary where atmospheric drag becomes noticeable.

Outer space within the solar system is called interplanetary space, which passes over into interstellar space at the heliopause. The vacuum of outer space is not really empty; it is sparsely filled with several dozen organic molecules discovered to date by microwave spectroscopy, 2.7 K blackbody radiation left over from the Big Bang and the origin of the universe, and cosmic rays, which include ionized atomic nuclei and various subatomic particles. There are also gas, plasma and dust, and small meteors and material left over from previous manned and unmanned launches that are a potential hazard to spacecraft. Some of this debris re-enters the atmosphere periodically.

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RT @wigu: By Order from Internet High Command in Outer Space you are no longer allowed to use the word "This" as a complete sentence.
thraeryn (Tim Thraeryn) Sat, 07 Nov 2009 02:17:35 -0000
RT @wigu: By Order from Internet High Command in Outer Space you are no longer allowed to use the word "This" as a complete sentence.
By Official Order From Internet High Command in Outer Space you are no longer allowed to use the word "This" as a complete sentence.
wigu (Jeffrey Rowland) Sat, 07 Nov 2009 02:17:26 -0000
By Official Order From Internet High Command in Outer Space you are no longer allowed to use the word "This" as a complete sentence.
OK, Rifftrax's version of Plan 9 from Outer Space.
pibegardel (andres) Sat, 07 Nov 2009 02:16:31 -0000
OK, Rifftrax's version of Plan 9 from Outer Space.
Meet me in outer space?
keen17 (joaquin zabala) Sat, 07 Nov 2009 02:13:31 -0000
Meet me in outer space?
How sci-fi! A spa in outer space! http://www.galacticsuite.com/
sansandl (Sansan de Leon) Sat, 07 Nov 2009 02:13:22 -0000
How sci-fi! A spa in outer space! http://www.galacticsuite.com/
Ayyyye it feel like I'm in a dream everythin floatin n shit feel like I'm on a voyage 2 outer. Space hell 2 da nawz
lilgee83 (Gee Terrell) Sat, 07 Nov 2009 02:09:22 -0000
Ayyyye it feel like I'm in a dream everythin floatin n shit feel like I'm on a voyage 2 outer. Space hell 2 da nawz

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