archive: SETI Higher CO2 levels on earth type planets

SETI Higher CO2 levels on earth type planets

Ron Blue ( (no email) )
Fri, 4 Sep 1998 22:36:18 -0400

When the Mars sized object hit the Earth about 4.5 billion years ago and created
the moon it also blew away the CO2/methane atmosphere. Ultimately, the ice
experienced by the earth, 90% of the time, may not have occurred if the
atmosphere had remained. Rapid changes may be necessary for evolution
and ultimately the development of intelligent life.

Standard models of planet formation suggest that the average earth would be
1.3 earth masses. Such earths would be very warm and have violent weather.
A large moon is necessary to keep the north/south poles locked into position
for our traditional weather patterns. Planets without a large moon would have
rapid climate changes due to relativity space-time distortions from their star.
This would randomly point the planet's north pole toward the star and its south
pole toward the star every 3 million years. This should speed up evolution for
the average

High CO2 levels, however, may result in a loss of bones and may block the
emergence of animal life on planets. This could significantly reduce the number
technologically intelligent species in the universe.

Ron Blue