Path: ...!eternal-september.org!feeder3.eternal-september.org!news.szaf.org!nntp-feed.chiark.greenend.org.uk!ewrotcd!news.eyrie.org!beagle.ediacara.org!.POSTED.beagle.ediacara.org!not-for-mail
From: Ernest Major <{$to$}@meden.demon.co.uk>
Newsgroups: talk.origins
Subject: Re: Enough liquid water on Mars to cover the surface to a depth of 1
 mile
Date: Thu, 22 Aug 2024 22:32:19 +0100
Organization: A noiseless patient Spider
Lines: 29
Sender: to%beagle.ediacara.org
Approved: moderator@beagle.ediacara.org
Message-ID: <va8ap2$is9i$2@dont-email.me>
References: <v9g8ie$o3e$1@dont-email.me> <va2oif$3g1hi$1@dont-email.me>
 <va2tuk$3grbp$1@dont-email.me> <va5leu$nd2$1@dont-email.me>
 <va86gg$ieml$1@dont-email.me>
Reply-To: {$to$}@meden.demon.co.uk
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit
Injection-Info: beagle.ediacara.org; posting-host="beagle.ediacara.org:3.132.105.89";
	logging-data="85002"; mail-complaints-to="usenet@beagle.ediacara.org"
User-Agent: Mozilla Thunderbird
To: talk-origins@moderators.isc.org
Cancel-Lock: sha1:ZXvLTgThdL875QPgsh2IN8jiWaU=
Return-Path: <news@eternal-september.org>
X-Original-To: talk-origins@ediacara.org
Delivered-To: talk-origins@ediacara.org
	id 82C6922986F; Thu, 22 Aug 2024 17:32:24 -0400 (EDT)
	by beagle.ediacara.org (Postfix) with ESMTPS id 613B122978C
	for <talk-origins@ediacara.org>; Thu, 22 Aug 2024 17:32:22 -0400 (EDT)
	id E5571872A8; Thu, 22 Aug 2024 17:32:22 -0400 (EDT)
Delivered-To: talk-origins@moderators.isc.org
	by mod-relay.zaccari.net (Postfix) with ESMTPS id B764E7FC26
	for <talk-origins@moderators.isc.org>; Thu, 22 Aug 2024 17:32:22 -0400 (EDT)
DKIM-Filter: OpenDKIM Filter v2.11.0 mod-relay.zaccari.net B764E7FC26
	(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
	 key-exchange X25519 server-signature ECDSA (P-256))
	(No client certificate requested)
	by smtp.eternal-september.org (Postfix) with ESMTPS id D56375F829
	for <talk-origins@moderators.isc.org>; Thu, 22 Aug 2024 21:32:19 +0000 (UTC)
Authentication-Results: name/D56375F829; dmarc=none (p=none dis=none) header.from=meden.demon.co.uk
	id 68249DC01A9; Thu, 22 Aug 2024 23:32:19 +0200 (CEST)
X-Injection-Date: Thu, 22 Aug 2024 23:32:19 +0200 (CEST)
In-Reply-To: <va86gg$ieml$1@dont-email.me>
X-Auth-Sender: U2FsdGVkX19GYEgWFMB466GPVNUUtTHx7wWvlx6J4p7KJS95pVUL2UfVAT0So0aqSGuY+Bkq3IyW0U8XXzMIkw==
Content-Language: en-GB
	FORGED_MUA_MOZILLA,HEADER_FROM_DIFFERENT_DOMAINS,SPF_HELO_NONE,
	SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no
	version=3.4.6
	smtp.eternal-september.org
Bytes: 3994

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.

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.

-- 
alias Ernest Major