Talk:Exosphere

message: Exosphere is defined by the large mean free path, vs. thermal models that can be used below.
=== Exobese vs. ThermopauseBold text
This difference is explained on Talk:Thermopause.  —Preceding unsigned comment added by 76.4.182.98 (talk) 04:29, 13 February 2008 (UTC)
thread_title:  Untitled 

message: The picture in this article is magnificently bad, for many obvious reasons. Should we just replace it with the one found on the troposphere http://en.wikipedia.org/wiki/Troposphere page (i.e. shrink it?) Unless anyone else has better images.  —Preceding unsigned comment added by 170.63.96.108 (talk) 17:50, 27 May 2010 (UTC)
thread_title:  Picture 

message: Exosphereyishnessocity!!!  —Preceding unsigned comment added by 65.31.109.237 (talk) 19:13, 6 March 2009 (UTC)
thread_title:  Exosphere 

message: Isn't the Exosphere part of the Ionosphere?  If that is the case, why isn't Ionosphere mentioned in the article at all?  Shouldn't it be included? Stevenmitchell (talk) 09:19, 8 October 2009 (UTC)
thread_title:  Exosphere Part of Ionosphere? 

message: I believe this article should be assessed for quality, probably into the Start-Class.Us441 (talk) 22:14, 27 December 2009 (UTC)
thread_title:  Assess 

message: The caption for the pic of the atmosphere layers says, "From Earth's surface to the top of the stratosphere (50km) is just under 12% of Earth's radius."  According to the article Earth Radius, the whole radius is 6371 km.  50/6371 is .0078, i.e. 0.78%.  I'm thinking the "12%" should be changed to "1%".  Any objextions?
Adawggg (talk) 20:10, 25 March 2014 (UTC)
replies: text: I noticed this myself. Not only is this clearly wrong for the reason you stated, but the articles for stratosphere, mesosphere, and thermosphere use the same image with a similar caption which correctly reads "1%". I've gone and ahead changed this. 76.191.16.10 (talk) 14:12, 30 March 2014 (UTC)
thread_title:  Math in caption seems inaccurate 

message: ...seems to be 384,000 km. According to other Wikipedia articles. So why does this article state that it's a mere 190,000 km? That's HALF the distance. The article says that is the full distance. 187.64.231.36 (talk) 19:58, 14 August 2015 (UTC)
thread_title:  The distance between the Earth and the Moon... 

message: The moon has an exosphere, as do various other solar-system bodies. As a nod to that, and because it’s interesting, would it be worthwhile to quote the pressure of a pure-Hydrogen atmosphere marking the lower boundary of the exosphere? Ideally in bar. And perhaps also for pure-Nitrogen? JDAWiseman (talk) 21:51, 17 August 2015 (UTC)
thread_title:  Earth-centric 

message: The introductory line of "where the density is too low for them to behave as a gas by colliding with each other" is puzzling. Collision frequency isn't a prerequisite to gaseous behaviour, and gas phase collisions do happen in the exosphere. Just as they still happen in the interstellar medium, which is typically at a much lower density and where molecules are typically considered to be in the gas phase.  In fact, further down in this article, the exobase is defined as "the height at which upward-traveling molecules experience one collision on average," where that average 1 collision must, by definition, occur in the exosphere.
Therefore, that line in the introduction appears to be nonsensical. Bluntly. --InvaderXan (talk) 18:07, 23 September 2016 (UTC)
thread_title:  Gas 

message: The exosphere (Ancient Greek: ἔξω éxō "outside, external, beyond", Ancient Greek: σφαῖρα sphaĩra "sphere") is a thin, atmosphere-like volume surrounding a planet or natural satellite where molecules are gravitationally bound to that body, but where the density is so low that the molecules are essentially collision-less.[1] In the case of bodies with substantial atmospheres, such as Earth's atmosphere, the exosphere is the uppermost layer, where the atmosphere thins out and merges with outer space. It is located directly above the thermosphere. Very little is known about it due to a lack of research. Mercury, the Moon, Ceres, Europa, and Ganymede have surface boundary exospheres, which are exospheres without a denser atmosphere underneath. The Earth's exosphere is mostly hydrogen and helium, with some heavier atoms and molecules near the base.[2] 103.26.224.46 (talk) 05:23, 29 July 2023 (UTC)
thread_title:  The exosphere (Ancient Greek: ἔξω éxō "outside, external, beyond", Ancient Greek: σφαῖρα sphaĩra "sphere") is a thin, atmosphere-like volume surrounding a planet or natural satellite where molecules are gravitationally bound to that body, but where the density is so low that the molecules are essentially collision-less.[1] In the case of bodies with substantial atmospheres, such as Earth's atmosphere, the exosphere is the uppermost layer, where the atmosphere thins out and merges with outer space. It is located directly above the thermosphere. Very little is known about it due to a lack of research. Mercury, the Moon, Ceres, Europa, and Ganymede have surface boundary exospheres, which are exospheres without a denser atmosphere underneat 

message: Earth's Atmosphere Extends Far Beyond the Moon, Scientists Discover 97.120.46.138 (talk) 12:40, 15 August 2023 (UTC)
thread_title:  Earth's Atmosphere Extends Far Beyond the Moon, Scientists Discover 

message: — Assignment last updated by Aleaton02 (talk) 02:02, 20 April 2024 (UTC)
thread_title: Wiki Education assignment: SPAC 5313 - Planetary Atmospheres