|MadSci Network: Astronomy|
If the chemicals settled in layers around the sun during formation of the solar system, why is there methane and ammonia on Earth as well as on the outer planets? Shouldn't each substance be found in only one general area of the solar system? We've heard that temperature and gravity cause substances to be found in certain parts of the solar system, are there other factors that contribute to this?
Re: Why are the same substances present on more than one planet?
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