Bok
04-19-2013, 06:37 PM
Scientists struggle to understand how early Earth stayed warm enough for liquid water
More... (http://www.sciencenews.org/view/feature/id/349771/title/Faint_Young_Sun)
More... (http://www.sciencenews.org/view/feature/id/349771/title/Faint_Young_Sun)