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PostPosted: Mon Dec 19, 2016 12:25 pm 
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Posts: 227
hiro wrote:
Methane is therefore the most active greenhouse gas in planets in the outer zone?

I seem to recall there's a measurable greenhouse effect on Pluto, but I'd have to go back through the papers to remember what causes it.

Edit: Yes, caused by methane and carbon monoxide.

Agemegos wrote:
Something is producing methane on Titan and Mars.

Exactly what is a subject for controversy on both. In Titan's case, it's possible that the current abundance of methane is a recent and relatively short-lived (~ millions of years, rather than 10's or 100's of millions) phenomenon.


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PostPosted: Tue Dec 20, 2016 3:05 am 
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Pluto is a mystery, but I am pretty sure that Titan has flatulant space whales.

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PostPosted: Tue Dec 20, 2016 3:31 am 
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Joined: Sat Sep 01, 2012 2:44 pm
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God made Pluto to train the faithful and the faithful have been herding space cows in huge underground caverns waiting for the messiah.

Apologies for the OT post.


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PostPosted: Tue Apr 04, 2017 11:43 pm 
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According to Perez-Becker, D. & Chiang, E. [2013]*, there are circumstances in which a planet's capacity to retain vapours of iron (molecular weight 56) and silica (molecular weigh 60) become are relevant. "When dayside temperatures surpass ∼2000 K, rocks, particularly silicates and iron (and to a lesser extent, Ti, Al and Ca), begin to vaporize. If the planet mass is low enough, thermal velocities of the high-metallicity vapour could exceed escape velocities."

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* "Catastrophic evaporation of rocky planets" in Monthly Notices of the Royal Astronomical Society (2013) 433 (3): 2294-2309

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