ASTR 3 Lecture Notes - Lecture 8: Alko, Bisulfide, Liquid Hydrogen
Document Summary
Lecture 8: jovian planets (jupiter, saturn, uranus, neptune) Jupiter and saturn almost all h & he, very little metal/rock (less dense) Uranus & nepture <50% h & he, the rest h compounds (water, methane, ammonia), w/ some metal/rock. Hydrogen compounds more abundant than rock/metal, so jovian planets bigger. Gravity of large cores pull in h/he h/he atmospheres. Planets in denser part of nebula form first (jupiter, saturn), so they have more time to form bigger. Jupiter and saturn are ~the same size (radius) But jupiter is 3x more massive than saturn, so higher density. Gases compress; increasing mass only changes radius a little. Layers of layers of gas under ever higher p & t. Core (rock/metals, h compounds) metallic hydrogen (conducts electricity, viscous fluid) liquid hydrogen (compression of layers, dense and hotter) gaseous hydrogen (cold, very low density) visible clouds. Core (rock/metals) core (water, methane, ammonia) gaseous hydrogen visible clouds.
