From: Technotranscendence (neptune@mars.superlink.net)
Date: Thu Oct 04 2001 - 00:53:33 MDT
On Wednesday, October 03, 2001 6:31 AM Robert J. Bradbury
bradbury@aeiveos.com
> 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
http://www.sigmaxi.org/amsci/amsci/articles/01articles/delsemme.html) is
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
not over-replenished.
I wonder if having liquid oceans has an impact on having plate tectonics...
Cheers!
Daniel Ust
http://uweb.superlink.net/neptune/
This archive was generated by hypermail 2.1.5 : Sat Nov 02 2002 - 08:11:09 MST