NATS 1880 Chapter Notes - Chapter 10: Ocean Acidification, Precautionary Principle, Arctic Sea Ice Decline
Document Summary
Nats1880 chapter 10: the nature and evolution of habitability . Sun"s luminosity increase -> h abundance in core diminishes -> slow contraction & heating of core. Inner and outer hz boundaries change (increase) with time. Consider continuously habitable zone (chz) region that remains habitable from planet"s formation -> chz becomes narrower with time. Eventually, earth is sufficiently hot to initiate moist greenhouse effect (in 1-3 gyr) *moist greenhouse effect a process by which a planet could lose water when the atmospheric circulation allows water vapor to rise high enough to be broken apart by ultraviolet light from the sun. Sun will run out of h in the core and expand 100 fold as a red giant in 4-5 gyr. No more water as earth"s temperature reach 700 . Sun ends life as a planetary nebula and white dwarf. Migrate to another star system but these star will eventually die and galaxies will go dark.
