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    blcxfk's Avatar
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    Default astrophysics question?



    Titan, the largest satellite of Saturn has a radius of 2,575 km and a mass of 1.36 x 1023
    kg. The NASA Cassini probe has measured its average surface temperature to be -
    178°C. Which of the following gases would you expect to remain in the atmosphere of
    Titan: ammonia, methane, helium or hydrogen?

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    Michael Steen's Avatar
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    Default

    Why don't you look up each of those 4 on Wikipedia and find out at what temperature they precipitate out as a liquid? The one(s) that precipitates at a temperature lower than -178 is your candidate. Off the cuff, I'm guessing helium and hydrogen, but I haven't looked it up--as you should!!
    Last edited by Michael Steen; 11-04-2008 at 09:21 PM. Reason: number
    Learning the sky--one star at a time.
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