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Homework Help: Planetary atmospheres

  1. Feb 10, 2015 #1
    1. The problem statement, all variables and given/known data
    calculate approximately how much more massive the Earth would have to be before it could retain a significant hydrogen atmosphere, assuming the Earth’s density to be the same as its current value.

    2. Relevant equations
    Temperature limit to retain hydrogen in the earths atmosphere: T «< 5042 (Mp/Rp ) *mn
    Mp= ratio of mass of planet/body to Earth’s RE
    Rp = ratio of radius of planet/body to Earth’s
    mn= atomic mass number of gas particle

    3. The attempt at a solution
    not sure how to begin , any tips much appreciated
  2. jcsd
  3. Feb 10, 2015 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Reread the question for starters --- what's showing in "relevant equations" does NOT look terribly correct/useful.
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