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). There is no discrete boundary between the Earth's atmosphere and space, as the atmosphere gradually attenuates with increasing altitude. Outer space within the solar system is calledinterplanetary space, which passes over into interstellar space at what is known as the heliopause.
Outer space is certainly spacious, but it is far from empty. Outer space is sparsely filled with several dozen types of organic moleculesdiscovered to date by microwave spectroscopy, 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 is also some gas, plasma anddust, and small meteors. Additionally, there are signs of human life in outer space today, such as material left over from previous manned and unmanned launches which are a potential hazard to spacecraft. Some of this debris re-enters the atmosphere periodically.
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