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BookmarkOuter space, also simply called space, refers to the relatively empty regions of the universe outside the atmospheres of celestial bodies.
See also:
Outer space is used to distinguish it from airspace (and terrestrial locations).
Contrary to popular understanding, outer space is not completely empty (i.e.
a perfect vacuum) but contains a low density of particles, predominantly hydrogen gas, as well as electromagnetic radiation..
For more information about the topic Outer space, read the full article at Wikipedia.org, or see the following related articles:
Van Allen radiation belt — The Van Allen radiation belt is a torus of energetic charged particles (i.e. a plasma) around Earth, trapped by Earth's magnetic field. When the ... > read more
Space observatory — A space observatory is any instrument in outer space which is used for observation of distant planets, galaxies, and other outer space objects. A ... > read more
Solar radiation — Solar radiation is radiant energy emitted by the sun, particularly electromagnetic energy. About half of the radiation is in the visible short-wave ... > read more
Geosynchronous orbit — A geosynchronous orbit is a geocentric orbit that has the same orbital period as the sidereal rotation period of the Earth. It has a semi-major axis ... > read more
Note: This page refers to an article that is licensed under the GNU Free Documentation License. It uses material from the article Outer space at Wikipedia.org. See the Wikipedia copyright page for more details.
