Presentation on theme: "Part II: Building a Goldilocks World From the Big Bang to Habitable Planets."— Presentation transcript:
Part II: Building a Goldilocks World From the Big Bang to Habitable Planets
Outline: Formation of the planets Distribution (and redistribution) of volatiles Heat production and transport Radiation budget The traditional habitable zone Based on the approach in Jim Kastings How to Find a Habitable Planet
Negative Feedback on Greenhouse Warming The Carbonate Silicate Cycle (courtesy Jim Kasting) Constant source while volcanism is active Enhanced by higher temperature, more CO 2 Puts CO 2 back into circulation Enhanced by biology. Would still happen without, but with higher CO 2 levels Ocean-atmosphere exchange required to make this happen
Cautionary Tales for Worlds Aspiring to Habitability
year century million yr. billion yr. ten thousand yr. 100 millionmillion10,00010010.01 Hiroshima Tunguska K/T TNT equivalent yield (MT) Global catastrophe Tsunami danger (Credit: D. Morrison) Terrestrial Impact Frequency Armageddon Impact (Texas-sized!) Catastrophic depends on who you are and where you live...