PCS 182 Lecture Notes - Lecture 9: Small Solar System Body, Milky Way, Water Vapor

• School: Ryerson University
• Department: Physics
• Course: PCS 182
• Professor: Margaret Buckby

Document Summary

Pcs 182 life in the milky way galaxy week 2. Planet at right distance from primary star such that liquid water can exist to: Participate in many metabolic reactions in cells. >also, frozen water (ice) on a lake surface: Insulates the liquid water below the ice so that life can survive in it. Volcanic activity released h2o and other gases. Early earth crust was too hot for liquid water. W2o was in vapor form in atmosphere. Earth cooled -> vapor condensed -> centuries of continual rainfall. Low regions on surface filled with water. External sources of water: not comets = frozen dirty water, come from outer solar system. Deuterium content measured in lab meteorites have: > a d/h ratio similar to earth"s o(cid:272)ea(cid:374)s -> > a lower d/h than comets: earth"s o(cid:272)ea(cid:374)s pro(cid:271)a(cid:271)l(cid:455) for(cid:373)ed fro(cid:373) (cid:272)o(cid:374)de(cid:374)satio(cid:374) of (cid:448)ol(cid:272)a(cid:374)i(cid:272) h2o vapor and impacts of meteorites and asteroids, different planets have different d/h ratios.