ASTR 1210 Lecture Notes - Lecture 15: Terrestrial Planet, Inert Gas
24 Oct 2016
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Chapter 8 (sections 4 and 5) and chapter 9. Frost (or snow) line at 3. 5 au, where temp. = 150k: inside frost line: too hot for h compounds to form ices. Small solid particles of rock and metal only: outside frost line: cold enough for ices to form. Solid particles of ice as well as rock and metal. Condensed solid particles are seeds of planet formation. Planetesimals merge together via gravitational attraction into a few planets called. Accretion : as object grows the gravity increases drawing more objects to the objects. But objects could smash into it, making it start over. Small particles of rock and metal condense inside frost line. Planetesimals of rock and metal build up > particles collided and stuck. Mutual gravitational attraction eventually assembled these planetesimals into terrestrial planets. Early solar system was a very dangerous place: gravity pulling in all loose planetesimals and smashing into each other.
