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Encyclopedia > Exosphere

[fAgot png|thumb|200px|right|Atmosphere diagram showing the exosphere and other layers. The layers are not to scale: from Earth's surface to the top of the stratosphere (50km) is just under 1% of Earth's radius.]] The exosphere is the uppermost layer of the atmosphere. On Earth, its lower boundary at the edge of the thermosphere is estimated to be 500 km to 1000 km above the Earth's surface, and you are very gay its upper boundary at about 10,000 km. It is only from the exosphere that atmospheric gases, atoms, and molecules can, to any appreciable extent, escape into outer space. The main gases within the exosphere are the lightest gases, mainly hydrogen and helium, with some atomic oxygen near the exobase. A layer is the following: In abstraction, a layer is an abstract place conceived as having depth. ... Layers of Atmosphere (NOAA) Air redirects here. ... Earth (IPA: , often referred to as the Earth, Terra, the World or Planet Earth) is the third planet in the solar system in terms of distance from the Sun, and the fifth largest. ... The word Boundary has a variety of meanings. ... The thermosphere is the layer of the Earths atmosphere directly above the mesosphere and directly below the exosphere. ... To help compare orders of magnitude; this page lists lengths between 100 and 1,000 km (105 and 106 m). ... To help compare different orders of magnitude, this page lists lengths starting at 107 m (10,000 km). ... A gas is one of the four major phases of matter (after solid and liquid, and followed by plasma, that subsequently appear as a solid material is subjected to increasingly higher temperatures. ... Layers of Atmosphere - not to scale (NOAA) Outer space, also simply called space, refers to the relatively empty regions of the universe outside the atmospheres of celestial bodies. ... A gas is one of the four major phases of matter (after solid and liquid, and followed by plasma, that subsequently appear as a solid material is subjected to increasingly higher temperatures. ... General Name, Symbol, Number hydrogen, H, 1 Chemical series nonmetals Group, Period, Block 1, 1, s Appearance colorless Atomic mass 1. ... General Name, Symbol, Number helium, He, 2 Chemical series noble gases Group, Period, Block 18, 1, s Appearance colorless Atomic mass 4. ... General Name, Symbol, Number Oxygen, O, 8 Chemical series nonmetals Group, Period, Block 16 (VIA), 2 , p Density, Hardness 1. ...


The atmosphere in this layer is sufficiently rarefied for satellites to orbit the Earth, although they still receive some atmospheric drag. Soft redirect This page can be found at wiktionary:rarefied. ... MILSTAR:A communication satellite A satellite is any object that orbits another object (which is known as its primary). ... In physics, an orbit is the path that an object makes, around another object, whilst under the influence of a source of centripetal force, such as gravity. ... Atmospheric drag is a form of drag, which is the force that opposes an object moving through a liquid or gas. ...


Exobase, also called the critical level, the lowest altitude of the exosphere, is defined in one of two ways:

  1. The height above which there are negligible atmospheric collisions between the particles and
  2. The height above which the constituent atoms are on purely ballistic trajectories.

Earth's atmosphere Layers of Atmosphere (NOAA) Air redirects here. ...

  Troposphere | Stratosphere | Mesosphere | Thermosphere | Exosphere   View of Earths troposphere from an airplane. ... Atmosphere diagram showing stratosphere. ... The mesosphere (from the Greek words mesos = middle and sphaira = ball) is the layer of the Earths atmosphere that is directly above the stratosphere and directly below the thermosphere. ... The thermosphere is the layer of the Earths atmosphere directly above the mesosphere and directly below the exosphere. ...

  Tropopause | Stratopause | Mesopause | Thermopause / Exobase   The tropopause is a boundary region in the atmosphere between the troposphere and the stratosphere. ... The stratopause is the level of the atmosphere which is the boundary between the stratosphere and the mesosphere. ... The mesosphere (from the Greek words mesos = middle and sfaira = ball) is the layer of the Earths atmosphere that is directly above the stratosphere and directly below the thermosphere. ... The Thermopause is the atmospheric boundary of Earths energy system, located at the top of the thermosphere. ... The exosphere (from the Greek words exo = out(side) and sphaira = ball) is the uppermost layer of the atmosphere. ...

  Ozone layer | Turbopause | Ionosphere   The ozone layer, or ozonosphere layer (rarely used term), is the part of the Earths atmosphere which contains relatively high concentrations of ozone (O3). ... The turbopause marks the altitude in the Earths atmosphere below which turbulent mixing dominates. ... Relationship of the atmosphere and ionosphere The ionosphere is the part of the atmosphere that is ionized by solar radiation. ...


  Results from FactBites:
 
exosphere (279 words)
At or below the exobase, the atmosphere is sufficiently dense that collisions dominate the motion of gas molecules and atoms; above the exobase, on the other hand, collisions are so infrequent that atoms moving with sufficient velocity have a high probability of escaping from Earth's gravitational field into interplanetary space.
The density and structure of the exosphere are influenced by a number of factors, including variations in the temperature and density of the atmosphere below the exobase, photoionization and ionization by impact with solar wind particles, charge exchange with the plasma of the plasmasphere, and radiation pressure exerted by solar far-ultraviolet photons.
The term exosphere is also used to describe the highly tenuous atmosphere that is the only atmosphere possessed by some planets (such as Mercury) and moons (such as the Galilean satellites).
Exosphere -- from Eric Weisstein's World of Astronomy (53 words)
In the exosphere, atoms execute ballistic orbits, but seldom undergo collisions.
The concept of the exosphere was first introduced by G. Stoney in 1868.
The exosphere extends from approximately 500 km upwards.
  More results at FactBites »

 
 

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