PCS 182 Lecture Notes - Lecture 14: Atmospheric Methane, Exoplanet, Star Star

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

Document Summary

Life in the milky way galaxy term test 2. Sources of heat for a moon: primary star, molten interior, radioactive decay, tidal heating. Tidal heating of a moon: strong gravitational pull from parent planet, tidal force= difference between the parent planet on the near and far side of the moon, moon is constantly flexed warmth! If moon has slightly elliptical orbital magnitude and direction of tidal force keeps changing. Impact meteorites/asteroids: volcanic water vapour, comets= frozen dirty water come from outer solar system (deuterium, 2,1h) Comets have high deuterium/hydrogen (2. 1 h) ratio (d/h) compared to earths oceans. Atmosphere 90% nitrogen: 1. 4% methane (ch4) , ar, ethane (c2h6), and other hydrocarbons (h + c) At(cid:373)osphe(cid:396)e is (cid:1006)(cid:1004)(cid:1004)k(cid:373) high a(cid:374)d de(cid:374)se(cid:396) tha(cid:374) ea(cid:396)th(cid:859)s protects surface against radiation. 2005: huygens probe dropped to titan aerial views hills and forking channels carved by liquid methane and ethane.