faintyoungsun: Faint. Young. Sun

This is a discussion group following a conference on the Faint Young Sun Paradox held at the Space Telescope Science Institute in May, 2012. Astrophysical theory has the Sun too faint to account for liquid water on the Earth 3.8 billion years ago as the geological record indicates. Proposed atmospheric greenhouse models for the early atmosphere have yet to account for enough greenhouse heating. The paradox remains unresolved.