faint early Sun paradox pârâdaxš-e xoršid-e tâm-e âqâzin, ~ ~ kamtâb-e ~ Fr.: paradoxe du Soleil jeune faible The contradiction between a colder Sun (about 30% less luminous) some 4 billion years ago, as predicted by models, and the warm ancient Terrestrial and Martian climates derived from geological evidence. |