In article <slrnhijgqt.hcc....@my-286.myhome.westell.com>,
Dan Birchall <d...@naoj.org.REMOVE_TO_REPLY> wrote:
>alain...@sympatico.ca (Alain Fournier) wrote:The six most common elements in the universe are hydrogen,
>> What surprises me is its density, about 1870 kg/m^3, which
>> is consistent with 75% water and 25% rock. I'm no expert
>> in this area, but so much water (or other low density
>> liquid or solid) seems improbable to me.
>I'm not a planetary scientist either, but I googled, and this
helium, oxygen, carbon and neon*. If a world isn't massive/cold enough
to hold onto H2 (and given that neither helium nor neon will form
chemical compounds) the most common chemical compounds should
be made up of combinations of H, O and C. In other words, water
should be pretty common.
* From memory, by mass it's something like 70% H, 24% He, 11% O, 4.5% C
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