Outer Space

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Outer space in its strictest definition is the void present between celestial bodies including the earth. However, this space is not completely empty but consists of hard vacuum containing a low density of particles, electromagnetic radiation, magnetic fields, neutrinos, dust and cosmic rays. Outer space is the nearest natural approximation of pure vacuum and consists of only a few hydrogen atoms per cubic meter. For a comparison, the air we breathe contains more than one septillion molecules per cubic meter. It is due to this nearly perfect vacuum that celestial bodies effectively face no friction and are able to move freely in space along their ideal orbits for millions of years.
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