What keeps the atmosphere of a planet in place?

  1. Nov 29, 2007 #1
    What keeps the atmosphere of a planet in place? THZ
     
  2. jcsd
  3. Nov 29, 2007 #2

    russ_watters

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    Gravity.
     
  4. Nov 29, 2007 #3

    Integral

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    Note that the temperature of our atmosphere high enough that the average velocity of the lighter gases, Hydrogen and helium, is greater then the earths escape velocity. Thus we do not find them in our atmosphere.
     
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