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Stuck on a planetary physic problem; HELP

  1. Sep 22, 2014 #1
    As the solar nebula cooled, grains of dust achieved thermal equilibrium with the young sun. We can assume the young Sun had a luminosity of 75% of the present day value, find the distance from the sun at which grains of water ice first become stable; known as the snow line. Assume grains are slow rotators with an albedo of 0.4% with an emissivity of close to 1. In vacuum ice is stable over long time periods at temps below 150K.

    - the link has a copy of the steps to acquiring solution however where I appear to be stuck is determining how to calculate the highlighted values. Any help is appreciated!!
    Thank you :)
  2. jcsd
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