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Re: Dirty Snowball Worlds

by sigidunum@[EMAIL PROTECTED] Feb 17, 2008 at 04:02 AM

On Feb 17, 11:03 am, Logan Kearsley <chronosur...@[EMAIL PROTECTED]
> wrote:


> Thoughts?

This sounds very similar to "Snowball Earth", a theory that involves
super-ice-age conditions in the late Precambrian period.

http://en.wikipedia.org/wiki/Snowball_Earth

Take a look at that model temperature graph on the right: most of the
Earth has temperatures below freezing, though there's a band around
the equator that's warmer.

If you have half an hour, this site gives a good back-and-forth of
arguments for and against it:

http://www.snowballearth.org/

But whether or not the Earth was ever in such a state, it seems like a
plausible condition for an otherwise Earthlike planet.  (Albeit one
around a slightly cooler sun; back in the Proterozoic, the Sun was
5%-10% less luminous than it is today.)

One other problem is that Snowball Earth would have been a temporary
state, lasting only some tens of millions of years.  But that could
probably be handwaved too.


Doug M.




 29 Posts in Topic:
Dirty Snowball Worlds
Logan Kearsley <chrono  2008-02-16 23:03:04 
Re: Dirty Snowball Worlds
sigidunum@[EMAIL PROTECTE  2008-02-17 04:02:54 
Re: Dirty Snowball Worlds
Dave Farrance <DaveFar  2008-02-17 18:55:04 
Re: Dirty Snowball Worlds
af250@[EMAIL PROTECTED]   2008-02-17 23:28:45 
Re: Dirty Snowball Worlds
Tux Wonder-Dog <wes.pa  2008-02-20 23:39:27 
Re: Dirty Snowball Worlds
Logan Kearsley <chrono  2008-02-17 15:13:57 
Re: Dirty Snowball Worlds
Bryan Derksen <bryan.d  2008-02-18 08:48:14 
Re: Dirty Snowball Worlds
Logan Kearsley <chrono  2008-02-17 15:19:22 
Re: Dirty Snowball Worlds
sigidunum@[EMAIL PROTECTE  2008-02-18 06:10:04 
Re: Dirty Snowball Worlds
Logan Kearsley <chrono  2008-02-18 14:36:50 
Re: Dirty Snowball Worlds
Bryan Derksen <bryan.d  2008-02-19 01:12:12 
Re: Dirty Snowball Worlds
Logan Kearsley <chrono  2008-02-18 14:43:21 
Re: Dirty Snowball Worlds
Logan Kearsley <chrono  2008-02-19 16:44:29 
Re: Dirty Snowball Worlds
Bryan Derksen <bryan.d  2008-02-20 06:12:36 
Re: Dirty Snowball Worlds
Logan Kearsley <chrono  2008-02-19 23:17:44 
Re: Dirty Snowball Worlds
Crown-Horned Snorkack <  2008-02-20 08:27:46 
Re: Dirty Snowball Worlds
Logan Kearsley <chrono  2008-02-20 14:51:57 
Re: Dirty Snowball Worlds
Logan Kearsley <chrono  2008-02-20 14:54:11 
Re: Dirty Snowball Worlds
Tux Wonder-Dog <wes.pa  2008-02-22 00:22:08 
Re: Dirty Snowball Worlds
Crown-Horned Snorkack <  2008-02-21 08:27:56 
Re: Dirty Snowball Worlds
Logan Kearsley <chrono  2008-02-21 08:41:27 
Re: Dirty Snowball Worlds
af250@[EMAIL PROTECTED]   2008-02-21 18:51:10 
Re: Dirty Snowball Worlds
Logan Kearsley <chrono  2008-02-21 09:04:01 
Re: Dirty Snowball Worlds
Tux Wonder-Dog <wes.pa  2008-02-23 01:45:32 
Re: Dirty Snowball Worlds
Tim Little <tim@[EMAIL  2008-02-23 01:17:07 
Re: Dirty Snowball Worlds
Tux Wonder-Dog <wes.pa  2008-02-23 18:46:59 
Re: Dirty Snowball Worlds
Tim Little <tim@[EMAIL  2008-02-23 06:33:24 
Re: Dirty Snowball Worlds
Tux Wonder-Dog <wes.pa  2008-02-25 00:05:49 
Re: Dirty Snowball Worlds
Crown-Horned Snorkack <  2008-02-22 08:25:01 

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