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From: William Hyde <wthyde1953@gmail.com>
Newsgroups: talk.origins
Subject: Re: Enough liquid water on Mars to cover the surface to a depth of 1
 mile
Date: Fri, 23 Aug 2024 18:35:31 -0400
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Ernest Major wrote:
> On 22/08/2024 21:19, William Hyde wrote:
>> Ernest Major wrote:
>>> On 20/08/2024 21:22, William Hyde wrote:
>>>>
>>>> In fact, if CO2 is the main greenhouse gas, the amount require to 
>>>> make Mars habitable also makes it uninhabitable. Nor can any such 
>>>> atmosphere hold enough H2O to matter.  Vast amounts of some neutral, 
>>>> stable, GHG are required. ArNe2 would be perfect, if only it 
>>>> existed. CFCs possibly, though they do eventually break down.
>>>
>>> WikiPedia tells me that ArNe2 does exist; at 4K. 
>>
>> And it's Ne2?  That was just a guess, or even less than a guess.
> 
> I thought that you'd picked on ArNe2 because greenhouse cases have to be 
> at least triatomic (because you need bending modes for infra-red 
> absorption), any known triatomic gas is problematic in some fashion at 
> the concentrations necessary, and neon and argon are the commonest noble 
> gases.


Exactly my line of guesswork.

> 
> With CFCs a question that comes to mind - at the concentrations required 
> in the Martian atmosphere is the equilibrium concentration of fluorine 
> and chlorine from their breakdown acceptable. (I suspect that it is, as 
> CFCs are extremely effective greenhouse gases.) At least one CFC 
> (halothane) is an anaesthetic, so there's that to take into account as 
> well.

As the UV flux is considerably lower than that on Earth, the compounds 
should last longer.

As we have created a very effective non-toxic greenhouse gas by 
accident, I wonder what we could produce if we actually tried.

William Hyde
>