3.3.5 Exosphere

Last updated at August 31, 2026 by

What is the very last, thinnest layer before space itself begins?
Exosphere
Exo-
Greek for 'outside'
-sphere
a layer
↓
The outermost layer, with very thin air that fades into outer space.
  • The exosphere is the uppermost layer of the atmosphere.
  • It is characterised by very thin air .
  • Light gases like helium and hydrogen float into space from here.
  • This happens because of the weak gravity at this height.
3.3.5 Exosphere - Atmosphere and Climate - [Teachoo] - Concepts
📝 What Have We Learned
  • The atmosphere has five layers based on temperature and density.
  • The troposphere is where nearly all weather happens.
  • The stratosphere holds the ozone layer and is ideal for flying.
  • The mesosphere burns up most meteors.
  • The thermosphere and exosphere border outer space itself.
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