Sent: Monday, September 14, 1998 3:06 PM
Subject: SETI Earth type planets reconsidered
Most of the extra-terrestrial planets we have discovered around have been jovian
types planets. The idea is that large gases planets kick lower mass
gases planets out of orbit through interaction over a long period of time. They
then fall into a lower orbit as a conservation of momentum.
If this occurs early in the history of the star, the jovian planet could have at
least one earth type moon in orbit at the right position in addition to its many
The earth type moon would be impacted by other bodies numerous times thereby
increasing the rate of evolution on that moon. An intelligent species that may
evolve on such a moon would be more likely to develop into a space traveling
by having so many moons to exploit in their local system.