Reference Article

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Outer space

Outer space, also simply called 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 completely empty (i.e. a perfect vacuum) but contains a low density of particles, predominantly hydrogen gas, as well as electromagnetic radiation.

Note: This article excerpts material from the Wikipedia article "Outer space", which is released under the GNU Free Documentation License.

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last updated on 2014-08-30 at 7:38 pm EDT

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Inflatable Heat Shield Survives Hypersonic Stress Test

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Songs From Space Reach Ears on Earth

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Reuters (Oct. 4, 2012) If you thought it was quiet in space, you were wrong. Instruments aboard NASA's orbiting Radiation Belt Storm Probes have picked up audio from the phenomenon known as "chorus" radio waves within Earth's magnetosphere, and they sound more like bird song than aliens from outer space. Turn up the volume to listen.
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