What keeps the atmosphere of a planet in place?

  1. What keeps the atmosphere of a planet in place? THZ
     
  2. jcsd
  3. russ_watters

    Staff: Mentor

    Gravity.
     
  4. Integral

    Integral 7,351
    Staff Emeritus
    Science Advisor
    Gold Member

    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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