Water Water Everywhere

by Brian Koberlein | 31 July 2018 | Astronomy

This is a companion discussion topic for the original entry at https://blog.briankoberlein.com/water-water-everywhere/

Venus has no moon, no magnetic field to protect its hydrogen, and an atmosphere of mainly CO2. A super large moon and the evolution of life appears to have changed all that for Earth. Could Mars have had an oxyigenated atmosphere without photosynthesis as a function of its 50% greater distance from a much less luminous sun?