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'''Atmosphere''' is the general name for a layer of gases that may surround a material body of sufficient mass. The gases are attracted by the gravity of the body, and held fast if [[gravity]] is sufficient and the atmosphere's temperature is low. Some planets consist mainly of various gases, and thus have very deep atmospheres.
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An '''atmosphere''' is the nasty sticky bit around a sufficiently large planet. From an Orbiter pilot's point of view, there are basically three sorts:
  
 
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* Thin enough to give little aerodynamic benefit, thick enough that you can't just ignore them. Example: [[Mars]]
From an Orbiter pilot's point of view,
 
an '''atmosphere''' is the nasty sticky bit around a sufficiently large planet; there are basically three sorts:
 
 
 
* Thin enough to give little aerodynamic benefit, but thick enough that you can't just ignore it. Example: [[Mars]]
 
  
 
* Thick enough to be useful aerodynamically; re-entry needs some care, but with sufficient preparation no fuel need be expended after the deorbit burn if a runway is available for landing. Example: [[Earth]], [[Titan]]
 
* Thick enough to be useful aerodynamically; re-entry needs some care, but with sufficient preparation no fuel need be expended after the deorbit burn if a runway is available for landing. Example: [[Earth]], [[Titan]]
  
* Thick enough to impair vehicle thrust if the [[complex flight model]] is enabled. Example: [[Venus]]
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* Thick enough to impair vehicle thrust if the complex [[flight model]] is enabled. Example: [[Venus]]
 
 
===See also===
 
*[[w:Atmosphere|Atmosphere at Wikipedia]]
 
  
[[Category: Articles]]
 
 
[[Category:Glossary]]
 
[[Category:Glossary]]
 
[[Category:Aerodynamics]]
 
[[Category:Aerodynamics]]
 
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