AY 101 - Sept 27 Lecture Notes
AY 101 - Sept 27 Lecture Notes AY 101
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This 2 page Class Notes was uploaded by Savannah L on Wednesday September 28, 2016. The Class Notes belongs to AY 101 at University of Alabama - Tuscaloosa taught by Jeremy Bailin in Spring2015. Since its upload, it has received 9 views. For similar materials see AY 101 - Intro to Astronomy - Jeremy Bailin in Astronomy at University of Alabama - Tuscaloosa.
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Date Created: 09/28/16
AY 101 – LECTURE SEPT 27 Terrestrial Planets: Mercury Mars Earth Venus o “Terra” = earth, made of dense solids (rock, metal) o Differentiated – dense material sunk to center How Can We Tell Internal Structures? Vibrations from earthquakes travel through Earth’s interior Some types of waves (like soundwaves) can travel through both liquid and solid Some (transverse) can only travel through solid Internal heat rises faster than cooling rate for larger planets; big planets cool and solidify slower Important Physical Processes Heat from the Sun o The closer a planet is to the sun, the more energy it receives (hotter surface) o In the absence of other effects, earth would be too cold for liquid water Greenhouse Gases o Heat gets trapped, raising temperature o Most important gases – water vapor, CO2, methane Geological Activity If the outside of a planet is molten: o Tectonics (renews surface) o Magnetic Field (protects atmosphere) o Volcanoes (outgas H20, C02, N2) Earth as an Example Large, inside is still molten hot o Volcanoes: provided N2, CO2, H2O; greenhouse effect o Tectonics: erase impact craters o Magnetic Field: protects atmosphere Moderate distance from sun o Liquid water temperatures (with greenhouse effect) o Most CO2 dissolved into oceans, now in seafloor rock Life o O2 in atmosphere o Non-equilibrium chemistry (ozone, excess CO2)