Outer space, conjointly merely known as space, refers to the comparatively empty regions of the universe outside the atmospheres of celestial bodies. location is employed to differentiate it from airspace (and terrestrial locations). there's no separate boundary between the Earth's atmosphere and house, because the atmosphere bit by bit attenuates with increasing altitude. location inside the scheme is termed region, that passes over into part at what's called the bound.
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Outer space is sparsely stuffed with many dozen styles of organic molecules discovered to this point by spectroscopy, black-body radiation left over from the massive bang and also the origin of the universe, and cosmic rays, that embody ionized atomic nuclei and varied subatomic particles. there's conjointly some gas, plasma and dirt, and little meteors. to boot, there ar signs of human life in location nowadays, like material left over from previous manned and unmanned launches that ar a possible hazard to craft. a number of this rubble re-enters the atmosphere sporadically.
Although the world is that the solely body inside the scheme notable to support life, proof suggests that within the distant past the world Mars possessed bodies of liquid water on the surface. For a quick amount in Mars' history, it's going to have conjointly been capable of forming life. at this time tho', most of the water remaining on Mars is frozen. If life exists in the slightest degree on Mars, it's presumably to be placed underground wherever liquid water will still exist.
Conditions on the opposite terrestrial planets, Mercury and Venus, seem to be too harsh to support life as we all know it. however it's been conjectured that Galilean satellite, the fourth-largest moon of Jupiter, might possess a sub-surface ocean of liquid water and will probably host life.
Astronomers have began to discover extrasolar Earth analogs – planets that lie the livable zone of house encompassing a star, and thus might presumably host life as we all know it.