Astronomy 2021A/B Lecture Notes - Lecture 10: Northern Hemisphere, Solar Core, Plate Tectonics

• School: Western University
• Department: Astronomy
• Course: Astronomy 2021A/B
• Professor: Alyssa Gilbert

Document Summary

Chapter 10 the nature and evoluion of habitability. Based on the range of distances at which worlds similar to earth could exist. Being in a habitable zone is not suicient enough to make a world habitable. Habitable zones evolve with ime, expect to move outward with ime. Could life exist outside the habitable zone: small pockets of subsurface groundwater mars. Kept liquid by geological condiions, not solar heat: subsurface oceans europa, ganymede, enceladus. Internal heat itself could keep surface warm enough for liquid water if surface was protected against heat loss by a think h atmosphere. Diference due to where the co@ is located venus atmosphere vs earth carbonate rocks or dissolved in oceans. Venus lacks a carbon cycle because it doesn"t have liquid water for co2 to dissolve. Diference in co2 is a direct consequence of a diference in liquid water: lack of water on venus. Water outgassed by volcanoes on earth sill there in oceans.