On Wednesday, October 03, 2001 6:31 AM Robert J. Bradbury
> The point about avoiding radiation due to impacts on the magnetosphere
> and possible loss of hydrogen does seem moderately important though.
> However, it looks like there may be a lot of "water worlds" out there
> and so one could argue that occasional magnetosphere disruptions could
> actually be a good thing since the H loss would likely eventually bring
> some of the ocean floor above sea level.
If "An Argument for the Cometary Origin of the Biosphere" by Armand H.
Delsemme (in _American Scientist_ September-October 2001; see
right, the Earth probably lost a few oceans and atmospheres early in its
history which were, lucky for us, replenished by comets several times, but
I wonder if having liquid oceans has an impact on having plate tectonics...
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