On Mar 9, 5:52=A0pm, Brian Davis <brda...@[EMAIL PROTECTED]
> wrote:
> On Mar 9, 6:11=A0pm, Douglas Berry <penguin_...@[EMAIL PROTECTED]
>
> wrote:
> > The problem is Mars' lack of an active core to renew the atmosphere.
> > In a relatively short time (in geological terms) the g***** and
> > liquids liberated from the comet will be lost to space.
[...]
> If you assume an N2-dominated atmosphere, v_rms is faster, but not
> terribly:
> v_rms =3D sqrt( 3 * 1000 * (8314/28) ) =3D 944 [m/s]
> Even that's enough for the atmospheric lifetime to be measured in 10's
> of *millions* of years. [...]
Also, whatever scheme you use to bulk up Mars's atmosphere
in the first place can presumably be used to keep it topped up.
Isaac Kuo
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