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Newsgroups: sci.space.science
From: jdnic...@panix.com (James Nicoll)
Date: Thu, 17 Dec 2009 18:39:03 EST
Local: Thurs, Dec 17 2009 6:39 pm
Subject: Re: New planet GJ 1214 b
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 You must Sign in before you can post messages.
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