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PostPosted: Mon Dec 19, 2016 12:25 pm 

Joined: Tue Aug 12, 2008 1:16 pm
Posts: 256
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.

PostPosted: Tue Dec 20, 2016 3:05 am 

Joined: Sun Sep 07, 2008 12:06 am
Posts: 360
Pluto is a mystery, but I am pretty sure that Titan has flatulant space whales.

I really love Classic Traveller, especially without the Imperium ... There, I said it.
Now pass me a laser carbine and a couple of extra battery clips.

PostPosted: Tue Dec 20, 2016 3:31 am 

Joined: Sat Sep 01, 2012 2:44 pm
Posts: 187
Location: Colorado
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.

PostPosted: Tue Apr 04, 2017 11:43 pm 
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Joined: Sun Jul 06, 2008 1:04 pm
Posts: 1091
Location: the Retirement Coast, NSW, Australia
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."

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

— Brett Evill

My SFRPG setting, Flat Black

© My posts on SFRPG must not be reproduced beyond the board except with explicit permission from me.

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