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- Newsgroups: sci.space
- Path: sparky!uunet!wupost!udel!rochester!cantaloupe.srv.cs.cmu.edu!crabapple.srv.cs.cmu.edu!amon@elegabalus.cs.qub.ac.uk
- From: amon@elegabalus.cs.qub.ac.uk
- Subject: Re: Terraforming
- Message-ID: <1992Jul22.183853.152911@cs.cmu.edu>
- Date: Wed, 22 Jul 92 18:33:59 GMT
- Organization: [via International Space University]
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- Lines: 34
-
- Dr. Zubrin pointed out some interesting facts in his luncheon talk at
- the 1992 ISDC.
-
- If you raise the temperature of Mars by ~ 5C, it will go into a
- runaway greenhouse that will not stop until all the CO2 is gaseous.
-
- This will leave you with ~ 5psi CO2 atmosphere at ~50F with most
- water in the liquid state. It will take less than 10 years to occur.
-
- He had some very interesting graphs that showed how very close Mars
- is to a lower of two unstable points. I pointed out to him that
- because of the orbital changes in Mars over time, this could well
- happen naturally during the peak of the next "warm" cycle.
-
- He stated that a nuclear power plant in the GW range synthesizing and
- releasing NH4 would be sufficient to raise the temp by the requisite
- 5C in a short time.
-
- He suggested a faster method would be to use 4 Nerva class engines to
- move a large comet to impact. The extra gases would be enough to
- raise the temparture past the unstable point.
-
- Once the runaway occurs, the system is stable in the new
- configuration. Ie, Mars is metastable, it is in the lower
- "uninhabitable" state and it is very close to the pushover to fall
- into the the "habitable" state.
-
- An O2 atmosphere would take generations however. But with free water
- and lots of CO2 and mild temperatures, plants will get on just fine
- and will do the job with no further intervention.
-
- Humans could walk freely with nothing more than a scuba mask.
-
-
-