Earth's Climate: the 1st 4 Billion Years
Earth's Climate: the 1st 4 Billion Years
Earth's Climate: the 1st 4 Billion Years
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Faint Young Sun Paradox<br />
Faint<br />
Young<br />
Sun<br />
Paradox<br />
4 1 H--> 4 He<br />
Incr. density=<br />
incr. luminosity<br />
Liquid H 2 O existed<br />
>3.5 Ga (sed. rocks,<br />
life, zircon 18 O)