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Space or space or space (also referred to as the air), refers to the relatively empty parts of the Universe, outside the atmospheres of objects "celestial". The term outer space is used to distinguish it from airspace and location "terrestrial".
Because the Earth's atmosphere has no clear boundaries, but is composed of layers that gradually dwindling with increasing altitude, there is no clear boundary between the atmosphere and space. Altitude of 100 kilometers or 62 miles established by the Fédération Aéronautique Internationale is the definition most widely accepted as the boundary between atmosphere and space.