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#76 2005-08-21 06:36:39
- Shaun Barrett
- Member
- From: Cairns, Queensland, Australia
- Registered: 2001-12-28
- Posts: 2,843
Re: Water, not CO2 - Bad for terraformers?
The word 'aerobics' came about when the gym instructors got together and said: If we're going to charge $10 an hour, we can't call it Jumping Up and Down. - Rita Rudner
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#77 2007-03-03 17:51:07
- RickSmith
- Banned
- From: Vancouver B.C.
- Registered: 2007-02-17
- Posts: 244
Re: Water, not CO2 - Bad for terraformers?
It has been calculated that the ratio of escape velocity to average particle velocity (V.esc/V.av) can be used to estimate how long a gas can be retained by a planet.
Here's a table of figures to illustrate the relationship:-
RATIO TIME TAKEN FOR ALL THE GAS TO ESCAPE
7 Over 1 trillion years
6 Over 10 billion years
5 About 100 million years
4 Under 1 million years
3 Under 1 thousand years
Hi Shaun,
Great series of posts in this thread.
I have a quick question, where does the table above come from?
Warm regards, Rick
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