Earth Sciences Forum

sneez · Joined: 11 Aug 2007 Posts: 13

I am learning about other planet's evolution and their atmospheres. It is the foundation of basically any study on this topic, that all three planets started with the same exact (to a negligable degree of difference) conditions. The most important of all, it is assumption that the initial amount of water on all 3 planets was the same. I found this assumption very hard to over come.

I know about the D/H ratio of mars, earth and other supposed evidence of this assumption being true, but its not strong evidence to me. I just dont see the necessity of this being true, given all the different geophysical factors.

Anybody with more knowledge on this? opinion?